[polynomial] Change polynomial ring coefficient type to AnyType and allow a modarith type

[asraa]

This would remove the unnecessary coefficientModulus, since the coefficientType will encode the modulus if we have a modarith type.

[github-actions[bot]]

This issue has 1 outstanding TODOs:

• lib/Dialect/LWE/IR/NewLWEAttributes.td:326: Validate syntax of polynomial ring after coefficientType changes.

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