[mlir][sparse] Renaming mlir_sparse_tensor_utils library to SparseTensorRuntime

The "mlir_xxx_utils" naming scheme is reserved/intended for shared libraries, whereas this library must be static due to issues of linking DLLs on Windows.  So we rename the library to avoid any potential confusion.   In addition we also rename the ExecutionEngine/SparseTensorUtils.{h,cpp} files to match the new library name.

Reviewed By: aartbik, stella.stamenova

Differential Revision: https://reviews.llvm.org/D135613