Simple test application for SMP Linux port

Note that the IDF version of the FreeRTOS POSIX/Linux simulator is not tested here, that one is merely the upstream version.

Build

idf.py --preview set-target linux

Amazon FReeRTOS SMP configuration is already set via sdkconfig.defaults, no need to configure.

idf.py build

Run

idf.py monitor

After the test output, input: ![ignore] to not run the ignored test