Add a link to the Kconfig option CONFIG_POSIX_NETWORKING in
the documentation.
Additionally, add Kconfig options for other Network
dependencies in an effort to make POSIX Kconfig options
consistent with the specification.
Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
Recently, a race condition was discovered in `pthread_create()`
and `pthread_join()` that would trigger an assertion in
`kernel/sched.c` of the form below.
```
aborted _current back from dead
```
This was mainly observed in Qemu. Unfortunately, Qemu SMP
platforms exhibit a real and measurable "scheduler noise"
which makes testing rather difficult.
Signed-off-by: Christopher Friedt <cfriedt@meta.com>
