Implement ABI JSON parsing and code generation

[ch4r10t33r]

Description

Add ABI JSON parsing and automatic binding generation.

Location

• File: src/sol/macros.zig
• Line: 127

Current Status

Manual definitions work well.

Tasks

• Parse contract ABI JSON
• Generate Zig function bindings
• Generate event definitions
• Generate error definitions
• Compile-time code generation
• CLI tool for generation
• Tests with real ABIs

Priority

Low - Nice to have for DX