linalg-to-tensor-ext: plumb ciphertext-degree to linalg.matmul rewrites and distribute generic before pass

[copybara-service]

linalg-to-tensor-ext: plumb ciphertext-degree to linalg.matmul rewrites and distribute generic before pass

1. Allow linalg-to-tensor-ext to take in the tilingSize from the ciphertext degree for now
2. linalg-to-tensor-ext currently requires a type converter that upgrades the tensor sizes, and it currently requires (for matching) that matmuls are the single op in the generic. So distribute around matmuls in the rlwe pipelines

TODO: I just want to make sure (2) is actually required...

Part of lowering the MLP demo with loops for #1232

[j2kun]

Approved, though you may want to add a test in a PR next week to ensure my rework of this pass is compatible with your future needs.