Clean-up tasks for tfhe-rs emitter

[asraa]

• [ ] Handle non-memref Ciphertext args in tfhe-rs-emitter.: Right now, we assume that temp_nodes contains all possible input ciphertexts by inserting create_trivial and any memref.load ops from ciphertext memrefs into temp_nodes. This does not include ciphertext block args (right now, that is a slim chance since we would need a non-memref, single bit input).
• [ ] Handle variable shift value attributes. Right now, our pipeline will only use fixed values of 1 and 2 by LUT design

[github-actions[bot]]

This issue has 2 outstanding TODOs:

• lib/Target/TfheRust/TfheRustEmitter.cpp:190: This assumes that all ciphertexts are
• lib/Target/TfheRust/TfheRustEmitter.cpp:337: Insert block argument that are encrypted ints into

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