extra/gen_rodata_ld: Add gen_rodata_ld tool. #707

Job	Run time
Build and package cores	9m 13s
Split off zephyr_contrib	17s
Split off zephyr_main	16s
Split off zephyr	10s
Split off zephyr_unoq	7s
Test zephyr_main:giga	2m 37s
Test zephyr_main:opta	2m 30s
Test zephyr_main:nano33ble	2m 35s
Test zephyr_main:portentac33	2m 33s
Test zephyr_main:niclasense	2m 35s
Test zephyr_contrib:frdm_mcxn947	2m 28s
Test zephyr:unoq	2m 32s
Test zephyr_main:portentah7	2m 26s
Test zephyr_contrib:frdm_rw612	2m 26s
Test zephyr_contrib:ek_ra8d1	2m 32s
Publish jsons	51s
Publish core	0s
Collect logs	7s
verify-core	-1s
cleanup-artifacts	5s
	36m 19s

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