[llvm] [mlir] [mlir][Python] create MLIRPythonSupport (PR #171775)

[Alex Trotta via llvm-commits]

Ahajha wrote:

Ah yea, I believe our usage is weird. We just build these bindings completely stock, and we extend purely on the python side for some ops, and for other ops we have a completely in-house set of bindings that we're moving towards.

https://github.com/llvm/llvm-project/pull/171775