[WIP] Add literal generation for Int, Float, and String

[Copilot]

Implementation Plan for Literal Generation

• Understand the repository structure and AST nodes
• Identify the LiteralNode structure and token types
• Build the project successfully
• Implement genLiteralNode for INT_N (integer literals)
• Implement genLiteralNode for FLOAT_N (float literals)
• Implement genLiteralNode for STRING (string literals)
• Implement genLiteralNode for BOOL_CONST (boolean literals)
• Add CodeGen source files to CMakeLists.txt
• Build and verify the implementation
• Run code review and security checks

Original prompt

处理 TODO: Implement Literal generation (Int, Float, String, etc.) (来自 Compiler/CodeGen/generator.cpp)

Created from VS Code via the GitHub Pull Request extension.

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