[mlir] Python: Parse ModuleOp from file path (#126572)
For extremely large models, it may be inefficient to load the model into
memory in Python prior to passing it to the MLIR C APIs for
deserialization. This change adds an API to parse a ModuleOp directly
from a file path.
Re-lands
[4e14b8a](https://github.com/llvm/llvm-project/commit/4e14b8afb44af58ab7073bb8c0b52875599b0ae1).
