New RTC library implementation #674

Job	Run time
Build and package cores	10m 45s
Split off zephyr	15s
Split off zephyr_contrib	8s
Split off zephyr_unoq	7s
Split off zephyr_main	9s
Test zephyr_main:opta	2m 27s
Test zephyr_main:nano33ble	2m 26s
Test zephyr_main:portentah7	2m 38s
Test zephyr_contrib:frdm_mcxn947	2m 29s
Test zephyr_main:niclasense	2m 31s
Test zephyr_main:portentac33	2m 4s
Test zephyr_main:giga	2m 38s
Test zephyr_contrib:frdm_rw612	2m 21s
Test zephyr:unoq	2m 20s
Test zephyr_contrib:ek_ra8d1	2m 29s
Collect logs	7s
Publish jsons	13s
Publish core	0s
verify-core	0s
cleanup-artifacts	3s
	36m 10s

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