Python parser for LLVM proof hints.

[nishantjr]

We need a python parser for the LLVM's binary proof hint file. The proof hint will be parsed into a Task such as in https://github.com/runtimeverification/proof-generation/blob/main/ml/rewrite/tasks.py#L350.

Note that we cannot use Pyk's Kore data-structures for representing Kore, but must instead use this: https://github.com/runtimeverification/proof-generation/blob/main/ml/kore/ast.py

1. Implement parser from Binary kore to https://github.com/runtimeverification/proof-generation/pull/48 We can do this in one of these in one of two ways: a. Implement a direct parser b. Implement a conversion from Pyk's Kore data structures to our datastructures.
2. Implement parser from proof hint to Task https://github.com/runtimeverification/proof-generation/blob/main/ml/rewrite/tasks.py

[gtrepta]

blocked on https://github.com/runtimeverification/llvm-backend/pull/785