[FIRRTL] Improve canonicalization patterns for variadic cat and reduction operations

[uenoku]

This commit enhances FIRRTL canonicalization for variadic cat flatten. Several canonicalizations are added to pass the existing tests.

Reduction-Cat Patterns:

• Replace table-driven patterns for AndR/OrR/XorR with cat operands with C++
• AndRCat: Optimizes andr(cat(...)) by handling zero constants (-> 0) and all-ones constants (identity)
• OrRCat: Optimizes orr(cat(...)) by handling non-zero constants (-> 1) and zero constants (identity)
• XorRCat: Optimizes xorr(cat(...)) by preserving non-zero constants and eliminating zero constants

Cat Optimization Patterns:

• FlattenCat: Flattens nested cat operations into single cat operations for better optimization opportunities
• CatOfConstant: Folds successive constant operands in cat operations (e.g., cat(x, 3, 5, y) -> cat(x, 29, y))
• BitsOfCat: Optimizes bits extraction from cat operations by extracting directly from the appropriate operand when possible

The new patterns replace the previous table-driven AndRCat*, OrRCat*, and XorRCat* patterns since it's too complicated to handle the condition in tablegen

Close #8544