[Parser] Implement Ethereum ABI to JSON Translator

[mijinummi]

Title: [Parser] Implement Ethereum ABI to JSON Translator in libs/parsers

📝 Description

The core of SpecDoc is its ability to "read" contracts. We need a utility that takes a standard Ethereum JSON ABI and converts it into our internal SpecDocSchema format.

🎯 Goal

Develop a parser that extracts function names, input types, and output types from a standard ABI.

✅ Requirements

• Create a solidity.parser.ts file.
• Correctly identify read vs. write functions.
• Map standard Solidity types (uint256, address) to human-readable labels.