Implement Zq struct representing elements in ℤ/(2³²)ℤ ring arithmetic
with native u32 operations. Key features:

-  Fully derived Debug, Clone, Copy, PartialEq, Eq, and Default traits
-  Implements Add/Sub/Mul operator traits with implicit modulo reduction
-  Provides Assign variants for in-place operations (AddAssign, etc)
-  Macro-generated trait impls ensuring DRY principle adherence
-  Display trait for formatted output in user interfaces
-  Extensive test coverage including edge cases:
  - Additive/multiplicative identity properties
  - Wrapping overflow/underflow behavior
  - Assignment operator correctness
  - u32 conversion invariants
  - Display formatting checks

Enables safe, zero-cost abstraction for cryptographic primitives
requiring modular arithmetic (e.g., FHE schemes, lattice-based crypto).
Leverages:
-  Rust's wrapping arithmetic for constant-time operations
-  Type-safe API preventing raw integer misuse

Performance characteristics:
-  All operations compile to single CPU instructions
-  No heap allocations

Issue-URL: #17