Add preliminary support for ESP IDF and FreeRTOS

[sbgaia]

This PR adds preliminary support for building and running the reactor-uc library and its examples on FreeRTOS and ESP-IDF platforms, tested on the RP2040 (Pico) and ESP32 microcontrollers (#37).

[github-actions]

Benchmark results after merging this PR:

Benchmark results

Performance:

PingPongUc:
Best Time: 246.976 msec
Worst Time: 253.498 msec
Median Time: 246.890 msec

PingPongC:
Best Time: 174.632 msec
Worst Time: 179.513 msec
Median Time: 176.762 msec

ReactionLatencyUc:
Best latency: 49411 nsec
Median latency: 61388 nsec
Worst latency: 115948 nsec

ReactionLatencyC:
Best latency: 22359 nsec
Median latency: 61329 nsec
Worst latency: 192389 nsec

Memory usage:

PingPongUc:
text data bss dec hex filename
37386 760 8472 46618 b61a bin/PingPongUc

PingPongC:
text data bss dec hex filename
47658 878 384 48920 bf18 bin/PingPongC

ReactionLatencyUc:
text data bss dec hex filename
23651 736 2520 26907 691b bin/ReactionLatencyUc

ReactionLatencyC:
text data bss dec hex filename
43200 846 384 44430 ad8e bin/ReactionLatencyC

[github-actions]

Memory usage after merging this PR will be:

Memory Report

action_empty_test_c

	from	to	increase (%)
text	69479	69479	0.00
data	752	752	0.00
bss	12416	12416	0.00
total	82647	82647	0.00

action_microstep_test_c

	from	to	increase (%)
text	70308	70308	0.00
data	760	760	0.00
bss	12480	12480	0.00
total	83548	83548	0.00

action_overwrite_test_c

	from	to	increase (%)
text	70185	70185	0.00
data	752	752	0.00
bss	12480	12480	0.00
total	83417	83417	0.00

action_test_c

	from	to	increase (%)
text	70081	70081	0.00
data	760	760	0.00
bss	12480	12480	0.00
total	83321	83321	0.00

deadline_test_c

	from	to	increase (%)
text	64936	64936	0.00
data	768	768	0.00
bss	11776	11776	0.00
total	77480	77480	0.00

delayed_conn_test_c

	from	to	increase (%)
text	70423	70423	0.00
data	752	752	0.00
bss	13248	13248	0.00
total	84423	84423	0.00

event_payload_pool_test_c

	from	to	increase (%)
text	24353	24353	0.00
data	720	720	0.00
bss	480	480	0.00
total	25553	25553	0.00

event_queue_test_c

	from	to	increase (%)
text	29092	29092	0.00
data	728	728	0.00
bss	480	480	0.00
total	30300	30300	0.00

nanopb_test_c

	from	to	increase (%)
text	44218	44218	0.00
data	1928	1928	0.00
bss	320	320	0.00
total	46466	46466	0.00

physical_clock_test_c

	from	to	increase (%)
text	49792	49792	0.00
data	832	832	0.00
bss	640	640	0.00
total	51264	51264	0.00

port_test_c

	from	to	increase (%)
text	70326	70326	0.00
data	752	752	0.00
bss	13056	13056	0.00
total	84134	84134	0.00

reaction_queue_test_c

	from	to	increase (%)
text	28292	28292	0.00
data	728	728	0.00
bss	480	480	0.00
total	29500	29500	0.00

request_shutdown_test_c

	from	to	increase (%)
text	70318	70318	0.00
data	752	752	0.00
bss	12480	12480	0.00
total	83550	83550	0.00

startup_test_c

	from	to	increase (%)
text	64565	64565	0.00
data	760	760	0.00
bss	11776	11776	0.00
total	77101	77101	0.00

tcp_channel_test_c

	from	to	increase (%)
text	92307	92307	0.00
data	2288	2288	0.00
bss	14720	14720	0.00
total	109315	109315	0.00

timer_test_c

	from	to	increase (%)
text	64537	64537	0.00
data	752	752	0.00
bss	11776	11776	0.00
total	77065	77065	0.00

[edwardalee]

This looks to me like a very nice contribution!

[github-actions]

Coverage after merging esp32 into main will be

52.82%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
action.c	70%	65.38%	62.50%	71.88%	113–114, 127–128, 131–134, 137–138, 140–143, 145, 149, 152–155, 25, 40–42, 46, 48, 55–56, 63–65, 65, 65–68
builtin_triggers.c	90.91%	70%	100%	96.77%	14, 18, 40, 43
clock_synchronization.c	0%	0%	0%	0%	100–103, 105–106, 106, 106–109, 114–116, 116, 116–118, 120–122, 122, 122–124, 124, 124, 124, 124–126, 129, 13, 130, 132, 135, 137–139, 14, 141, 143, 143, 143–145, 147–149, 149, 149–151, 154, 156, 158, 16, 160–161, 161, 161–163, 163, 163, 166, 166, 166–167, 17, 170–175, 175, 175–176, 18, 180, 182–188, 188, 188–189, 19, 192, 195–199, 20, 200, 200, 200–201, 203, 205, 208, 210–214, 214, 214–215, 215, 215–224, 224, 224–225, 227, 23, 23, 23, 230–232, 234–236, 238, 238, 238–239, 24, 241, 244–245, 247–249, 25, 250–254, 254, 254–256, 26, 26, 26, 261–264, 264, 264–266, 268–269, 27, 273–275, 277–278, 278, 278–279, 279, 279–287, 287, 287–288, 290, 294, 297–298, 30, 301–310, 310, 310–311, 314, 317–320, 323, 323, 323, 323, 323, 323, 323, 323, 323–329, 33, 330–339, 34, 340–344, 347–348, 35, 350, 354–362, 364, 367, 367, 367–368, 372–376, 379, 379, 379–380, 383, 385, 40, 42, 44, 46, 49, 49, 49–51, 51, 51–52, 55, 58, 62, 64–66, 66, 66, 69, 69, 69–70, 73–79, 79, 79–80, 83, 89–90, 93, 95, 95, 95–97
connection.c	78.43%	53.33%	100%	87.88%	10, 104, 110, 123–124, 137–138, 14, 14, 144, 146–147, 149, 16–17, 21–22, 22, 22–23, 25, 27–28, 34, 48, 48, 48–49, 55, 60–62, 97
environment.c	94.12%	83.33%	100%	100%	16, 29
event.c	100%	100%	100%	100%
federated.c	6.53%	3.26%	10%	7.94%	10, 100–101, 103, 103, 103–104, 106, 106, 106, 106, 106–107, 107, 107–109, 11, 112, 112, 112–114, 117–118, 121–123, 123, 123–124, 124, 124–126, 128, 13, 131, 133, 135–139, 14, 140, 143–145, 147, 147, 147, 149, 15, 150–152, 154, 156, 156, 156–157, 159, 16, 160, 163–164, 171–173, 173, 173–174, 176, 178, 178, 178–179, 18, 18, 18, 180–181, 181, 181, 181, 181, 181, 181–189, 19, 19, 19, 190, 190, 190–191, 193–200, 202–205, 209, 21, 21, 21, 212, 212, 212–214, 216, 218, 22, 220–222, 222, 222, 222, 222–229, 23, 23, 23, 231–234, 234, 234–235, 237, 24, 240–243, 245, 25, 251–253, 266–267, 267, 267–268, 268, 268–269, 269, 269–270, 270, 270–271, 271, 271–272, 272, 272–273, 273, 273, 275, 275, 275–276, 276, 276–277, 277, 277–278, 278, 278–279, 279, 279, 281, 29–30, 34–39, 41, 43, 43, 43–44, 44, 44–45, 45, 45–46, 46, 46, 48, 50–53, 55, 55, 55–58, 58, 58–59, 61, 63–64, 64, 64–65, 69, 72–73, 73, 73–74, 76–78, 80, 84, 86, 88–90, 93, 95–99
logging.c	88.52%	83.33%	100%	89.36%	25, 38–40, 47, 60–61
network_channel.c	69.23%	62.50%	100%	70.59%	40, 40, 40, 45–48, 57
physical_clock.c	89.61%	83.33%	71.43%	93.10%	26, 41, 57–58, 81, 83
port.c	74.68%	42.86%	100%	91.49%	10, 10, 10, 15, 15, 15–16, 22, 26, 31, 31–33, 33, 33–34, 45, 45, 45–46
queues.c	86.11%	79.03%	100%	88.03%	100–106, 131–135, 138–139, 156, 161, 167, 34, 34, 38–44, 69–70, 96, 96
reaction.c	71.31%	56.52%	100%	78.87%	15, 21, 28–30, 30, 30–32, 32, 32–33, 43, 46, 53–54, 54, 54–56, 56, 56–57, 72, 88–90, 90, 90–93, 93, 93–94
reactor.c	69.33%	51.52%	100%	82.28%	10, 101–102, 14–19, 22, 28, 30, 32–37, 37, 37–38, 38, 38, 43, 55, 58–59, 59, 59–60, 60, 60–61, 63, 77–78, 81–82, 82, 82–83, 83, 83–84, 86, 91
serialization.c	37.50%	25%	50%	40%	16–17, 26–27, 33–34, 34, 34–35, 37–38, 41–42, 42, 42–43, 45–46
startup_coordinator.c	0%	0%	0%	0%	100,