Implement zero-dependency Wasm binary parser

[bbyalcinkaya]

This PR adds a new zero-dependency binary parser directly in pykwasm that parses Wasm bytecode and produces KAst terms of wasm-semantics. Previously, our parser relied on a py-wasm fork, as described in issue #524
. That dependency has been unmaintained for years and limited our ability to implement fixes, add new features, and stay up-to-date with the Wasm specification. This new parser eliminates the py-wasm dependency.

Changes

• Implement the Wasm binary parser
• Enable all binary parsing integration tests for the new parser
• Add unit tests for individual parsing components
• Implement differential testing to compare the old py-wasm-based parser with the new parser