Implement Morphir IR v4 Modules

[DamianReeves]

Description

This PR implements the Morphir IR v4 specification in Python.

Key Features

• Core Modules: Implementation of Naming, Types, Packages, Values (recursive AST), Distributions (Library/Specs), and Modules.
• Advanced Features:
  • Meta (FileMeta) & Refs (Ref) for provenance and deduplication.
  • Document: Schema-less dynamic data and DocumentLiteral.
  • Decorations: Layered metadata system.
• Refactoring: Name, Path, FQName are now immutable tuple-based types for robust runtime checking.
• Integration: Full JSON Serialization support.

Verification

• Added 18 test files.
• 66/66 unit tests passed.

Artifacts

• walkthrough.md contains a detailed summary of the implementation.

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