Feature/improve formatter

[tyrchen]

No description provided.

[Copilot]

Pull Request Overview

This PR improves the formatter functionality and language detection for the code documentation generator. Key changes include:

• Adding a new LanguageType::as_str method for converting language enums to string representations.
• Refactoring the ModuleUnit formatting logic to filter and process only public code elements.
• Updating the bank module to use WalkBuilder and adjust language determination for code blocks.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/parser/mod.rs	Adds LanguageType::as_str for consistent string representations.
src/parser/formatter/mod.rs	Refactors the formatting of public code elements via local filters.
src/bank.rs	Updates file parsing with WalkBuilder and language detection logic.
Cargo.toml	Bumps package version from 0.4.3 to 0.4.4.

Comments suppressed due to low confidence (2)

src/parser/formatter/mod.rs:252

• [nitpick] The variable name 'fns' is a terse abbreviation; consider renaming it to 'public_functions' for improved clarity.

let fns: Vec<&FunctionUnit> = self

src/parser/formatter/mod.rs:272

• [nitpick] The variable name 'mods' may be too abbreviated; consider renaming it to 'public_submodules' for better clarity.

let mods: Vec<&ModuleUnit> = self