feat: Add CPU features detection and stretched grid API (Phase 6) #128

Job	Run time
Build cpu wheel on ubuntu-latest	44s
Build cpu wheel on macos-latest	59s
Build cuda wheel on ubuntu-latest	2m 3s
Build cpu wheel on windows-latest	2m 7s
Build cuda wheel on windows-latest	11m 29s
Test cpu wheel on macos-latest with Python 3.9	37s
Test cpu wheel on macos-latest with Python 3.13	17s
Test cuda wheel on ubuntu-latest with Python 3.9	28s
Test cuda wheel on windows-latest with Python 3.9	8m 18s
Test cpu wheel on windows-latest with Python 3.13	40s
Test cpu wheel on ubuntu-latest with Python 3.9	14s
Test cpu wheel on ubuntu-latest with Python 3.13	15s
Test cuda wheel on ubuntu-latest with Python 3.13	32s
Test cpu wheel on windows-latest with Python 3.9	33s
Test cuda wheel on windows-latest with Python 3.13	9m 1s
	38m 17s

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