refactor!: move windows binaries to own optional depedency

[Fdawgs]

Closes #419.

Will reduce the package size for Linux and MacOS users by a good amount!

Checklist

• Run npm test
• Documentation has been updated and adheres to the style described in CONTRIBUTING.md
• Commit message adheres to the Conventional commits style, following the @commitlint/config-conventional config

[Copilot]

Pull Request Overview

This PR refactors the package to move Windows binaries into a separate optional dependency (node-unrtf-win32), significantly reducing the package size for Linux and macOS users. The Windows binaries and associated license files are removed from the main package and accessed via dynamic require() when needed.

• Windows binaries (unrtf.exe) and license files removed from src/lib/win32/
• Dynamic loading of node-unrtf-win32 optional dependency for Windows platform
• Updated license configuration to ignore the new optional dependency

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
package.json	Adds node-unrtf-win32 as an optional dependency
src/index.js	Updates constructor to dynamically require optional dependency with try-catch error handling
src/index.test.js	Updates test helper to use the optional dependency instead of local binary path
.licensee.json	Adds ignore rule for packages prefixed with node-unrtf
src/lib/win32/unrtf-0.19.3/COPYING	Removes GPL v2 license file for bundled Windows binary
src/lib/win32/unrtf-0.19.3-GnuWin32.README	Removes README for bundled Windows binary
src/lib/win32/unrtf-0.19.3/bin/unrtf.exe	Removes Windows binary executable

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