feat: add wit-codegen tool

[GordonSmith]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a comprehensive WIT (WebAssembly Interface Types) code generator tool that parses WIT files using ANTLR4 grammar and generates C++ host function bindings. The tool integrates with the existing cmcpp library to provide type-safe WebAssembly Component Model integration.

Key changes:

• Adds ANTLR4-based WIT grammar parser with comprehensive test suite (95+ official WIT test files)
• Implements wit-codegen tool that generates C++ bindings from WIT interface definitions
• Enhances WAMR sample with generated code and helper functions for simplified host application development

Reviewed Changes

Copilot reviewed 40 out of 44 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
vcpkg.json	Adds antlr4 dependency for grammar parsing
tools/wit-codegen/wit-codegen.cpp	Main WIT code generator implementation using ANTLR visitor pattern
grammar/Wit.g4	Complete ANTLR grammar for WebAssembly Interface Types specification
test/test_grammar.cpp	Test suite validating grammar against 95+ official WIT files
include/wamr.hpp	Enhanced with helper functions for context creation and memory management
samples/wamr/	Updated sample demonstrating generated bindings usage
CMakeLists.txt	Adds packaging configuration and version information

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.11%. Comparing base (72f9cda) to head (3cf7915).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   84.08%   84.11%   +0.03%     
==========================================
  Files          19       19              
  Lines        1445     1448       +3     
  Branches      129      129              
==========================================
+ Hits         1215     1218       +3     
  Misses        140      140              
  Partials       90       90              

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