Generate a helper that configures OpenFHE crypto context based on the IR content

[j2kun]

Right now the user must manually call functions like EvalMultKeyGen if the IR contains EvalMult, and EvalRotateKeyGen with known rotation shifts (which requires looking at the generated code to determine), as well as SetMultiplicativeDepth and SetPlaintextModulus.

We should have a pass in the OpenFHE dialect that generates a function that configures the cryptoContext appropriately.