[CoopVec] Add Linear Algebra common header with tests (#7350) #7388
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This PR introduces the linear algebra header file, and places it in a location that is by default included in all HLSL compilation. The builtins in the API aren't yet defined, and depend on the #7290 PR merging first.
The tests that have been added have temporary diagnostic messages while 7290 is in progress. They will need to be updated. Open to feedback on better / suggested error messages, or whether there shouldn't be any sema-level validation for these errors.
Fixes
#7304
Cherrypick of #7350