feat: add async version of listen in RPC engine

[lterrac]

Description

RPC Engine can listen in a non-blocking

Type of change

• CHANGE (fix or feature that would cause existing functionality to not work as expected)
• FEATURE (non-breaking change which adds functionality)
• BUGFIX (non-breaking change which fixes an issue)
• ENHANCEMENT (non-breaking change which improves existing functionality)
• NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

[github-actions]

Coverage arm64

Package	Line Rate	Branch Rate	Health
include.hicr.backends.boost	75%	43%	➖
include.hicr.backends.hwloc	76%	37%	➖
include.hicr.backends.mpi	96%	53%	✔
include.hicr.backends.nosv	71%	45%	➖
include.hicr.backends.pthreads	84%	44%	✔
include.hicr.core	72%	44%	➖
include.hicr.frontends.RPCEngine	100%	48%	✔
include.hicr.frontends.channel	95%	63%	✔
include.hicr.frontends.channel.fixedSize	100%	50%	✔
include.hicr.frontends.channel.fixedSize.mpsc.locking	91%	55%	✔
include.hicr.frontends.channel.fixedSize.mpsc.nonlocking	96%	55%	✔
include.hicr.frontends.channel.fixedSize.spsc	95%	68%	✔
include.hicr.frontends.channel.variableSize	92%	50%	✔
include.hicr.frontends.channel.variableSize.mpsc.locking	84%	48%	✔
include.hicr.frontends.channel.variableSize.mpsc.nonlocking	95%	48%	✔
include.hicr.frontends.channel.variableSize.spsc	91%	54%	✔
include.hicr.frontends.objectStore	63%	41%	➖
include.hicr.frontends.tasking	80%	56%	✔
Summary	82% (1817 / 2205)	47% (1093 / 2337)	✔

Minimum allowed line rate is 60%

[github-actions]

Coverage amd64

Package	Line Rate	Branch Rate	Health
include.hicr.backends.boost	75%	43%	➖
include.hicr.backends.hwloc	76%	37%	➖
include.hicr.backends.mpi	96%	53%	✔
include.hicr.backends.nosv	71%	45%	➖
include.hicr.backends.pthreads	84%	44%	✔
include.hicr.core	72%	44%	➖
include.hicr.frontends.RPCEngine	100%	49%	✔
include.hicr.frontends.channel	95%	63%	✔
include.hicr.frontends.channel.fixedSize	100%	50%	✔
include.hicr.frontends.channel.fixedSize.mpsc.locking	91%	55%	✔
include.hicr.frontends.channel.fixedSize.mpsc.nonlocking	96%	57%	✔
include.hicr.frontends.channel.fixedSize.spsc	95%	68%	✔
include.hicr.frontends.channel.variableSize	90%	50%	✔
include.hicr.frontends.channel.variableSize.mpsc.locking	84%	48%	✔
include.hicr.frontends.channel.variableSize.mpsc.nonlocking	95%	48%	✔
include.hicr.frontends.channel.variableSize.spsc	91%	54%	✔
include.hicr.frontends.objectStore	63%	41%	➖
include.hicr.frontends.tasking	80%	56%	✔
Summary	82% (1814 / 2202)	47% (1093 / 2333)	✔

Minimum allowed line rate is 60%