Add spmd_backend config flag - #3540
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Stack from ghstack (oldest at bottom):
Rename parallelism.full_dtensor: bool to parallelism.spmd_backend: Literal["default", "full_dtensor", "spmd_types"] and add debug.spmd_typechecking for the upcoming local-tensor SPMD path.
All existing callsites are updated mechanically:
full_dtensor=True/False -> spmd_backend="full_dtensor"/"default"
self.full_dtensor -> self.spmd_backend == "full_dtensor"
No new SPMD mesh construction or runtime plumbing yet. The spmd_types backend value is accepted here, and mesh/runtime logic lands in the next commit.