Switch all ports to auto-growing split heap

This simplifies allocating outside of the VM because the VM doesn't
take up all remaining memory by default.

On ESP we delegate to the IDF for allocations. For all other ports,
we use TLSF to manage an outer "port" heap. The IDF uses TLSF
internally and we use their fork for the other ports.

This also removes the dynamic C stack sizing. It wasn't often used
and is not possible with a fixed outer heap.

Fixes #8512. Fixes #7334.

Author: tannewt

.gitmodules

@@ -351,3 +351,6 @@
 [submodule "lib/certificates"]
 	path = lib/certificates
 	url = https://github.com/adafruit/certificates
+[submodule "lib/tlsf"]
+	path = lib/tlsf
+	url = https://github.com/espressif/tlsf.git

lib/libm/fabsf.c

@@ -0,0 +1,14 @@
+/*****************************************************************************/
+/*****************************************************************************/
+// fabsf from musl-0.9.15
+/*****************************************************************************/
+/*****************************************************************************/
+
+#include "libm.h"
+
+float fabsf(float x)
+{
+	union {float f; uint32_t i;} u = {x};
+	u.i &= 0x7fffffff;
+	return u.f;
+}

lib/tlsf

@@ -1271,10 +1271,6 @@ msgstr ""
 msgid "Invalid BSSID"
 msgstr ""
 
-#: main.c
-msgid "Invalid CIRCUITPY_PYSTACK_SIZE\n"
-msgstr ""
-
 #: shared-bindings/wifi/Radio.c
 msgid "Invalid MAC address"
 msgstr ""
@@ -2164,7 +2160,7 @@ msgid "Unable to allocate buffers for signed conversion"
 msgstr ""
 
 #: supervisor/shared/safe_mode.c
-msgid "Unable to allocate the heap."
+msgid "Unable to allocate to the heap."
 msgstr ""
 
 #: ports/espressif/common-hal/busio/I2C.c
@@ -2735,7 +2731,7 @@ msgstr ""
 msgid "can't set attribute"
 msgstr ""
 
-#: py/runtime.c shared-bindings/supervisor/Runtime.c
+#: py/runtime.c
 msgid "can't set attribute '%q'"
 msgstr ""
 
@@ -3004,12 +3000,6 @@ msgstr ""
 msgid "error = 0x%08lX"
 msgstr ""
 
-#: ports/espressif/common-hal/espcamera/Camera.c
-msgid ""
-"espcamera.Camera requires reserved PSRAM to be configured. See the "
-"documentation for instructions."
-msgstr ""
-
 #: py/runtime.c
 msgid "exceptions must derive from BaseException"
 msgstr ""