arch: arm: cortex_m: Implement USE_SWITCH support for armv8-m.mainline (and some other changes) #85080
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This Draft implements initial USE_SWITCH support for armv8-m.mainline.
It is unlikely to be correct. This PR also include changes that would be better delivered through independent PR.
This Draft PR aims at collecting feedback and advice as to how/where to implement the required changeds.