feat: add support for generating Markdown documentation and update re…

[GordonSmith]

…lated commands

[Copilot]

Pull request overview

This pull request adds support for generating Markdown documentation from WIT files using the wit-bindgen-markdown library, alongside the existing language binding generators (Rust, C, C#, Go, MoonBit).

Key Changes

• Integrated wit-bindgen-markdown 0.49 dependency and implemented Markdown generation in the Rust WASM module
• Added new VS Code command wit-idl.generateBindingsMarkdown with appropriate menu registrations
• Updated error messages and documentation to include "markdown" as a supported language option

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
wit-bindgen-wasm/src/lib.rs	Added markdown module import, implemented generate_markdown_bindings and generate_markdown_with_wit_bindgen functions, updated language matching to support "markdown" and "md"
wit-bindgen-wasm/Cargo.toml	Added wit-bindgen-markdown = "0.49" dependency
wit-bindgen-wasm/Cargo.lock	Added dependency entries for wit-bindgen-markdown, pulldown-cmark, and unicase
wit-bindgen-wasm/README.md	Updated API documentation to list markdown as a supported language option
src/extension.ts	Registered new generateMarkdownBindingsCommand using the existing command factory pattern
package.json	Added command definition, context menu entries, and command palette registration for the Markdown documentation command