Retire unsafe sparse tensor constructors in Python API (#91331)
This PR removes sparse tensor constructor functions `torch._sparse_coo/csr/csc/bsr/bsc/compressed_tensor_unsafe(...)` as unneeded. The equivalent functionality is provided via `torch.sparse_coo/csr/csc/bsr/bsc/compressed_tensor(..., check_invariants=False)`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91331
Approved by: https://github.com/amjames, https://github.com/cpuhrsch
