Rp2040 multithreaded target support #2907

Job	Run time
build-rti / run (ubuntu-latest)	7s
build-trace-tools / run (ubuntu-latest)	8s
check-labels / check	2s
build-rti / run (macos-latest)	10s
fetch-lf / extract-ref	2s
build-trace-tools / run (macos-latest)	7s
build-rti / run (windows-latest)	15s
build-trace-tools / run (windows-latest)	25s
unit-tests-multi / run (ubuntu-latest)	30s
unit-tests-single / run (ubuntu-latest)	10s
unit-tests-multi / run (macos-latest)	12s
unit-tests-single / run (macos-latest)	11s
lf-default-flexpret / flexpret-tests	11m 43s
lf-default / regular-tests (ubuntu-latest)	26m 4s
lf-adaptive / regular-tests (ubuntu-latest)	25m 58s
lf-default-arduino / arduino-tests (ubuntu-latest)	3m 4s
lf-default / regular-tests (macos-latest)	25m 55s
lf-adaptive / regular-tests (macos-latest)	25m 46s
lf-default-arduino / arduino-tests (macos-latest)	4m 21s
lf-default / regular-tests (windows-latest)	1h 32m 40s
lf-default-zephyr / zephyr-tests	42m 4s
lf-adaptive / regular-tests (windows-latest)	1h 33m 19s
lf-python / regular-tests (ubuntu-latest)	17m 6s
lf-python / regular-tests (macos-latest)	18m 32s
lf-gedf-np / regular-tests (ubuntu-latest)	26m 13s
lf-python / regular-tests (windows-latest)	1h 6m 40s
lf-gedf-np / regular-tests (macos-latest)	25m 54s
lf-gedf-np / regular-tests (windows-latest)	1h 33m 57s
	10h 1m 35s

Provide feedback