✨ Hover Provider Extension API

# Overview
The purpose of the hover provider is to provide tooltip like notifications when the cursor is held over a segment of text in the code editor. Like the Code Completion provider, the hover provider provides functionality that should also be available through the LSP.

## Resources
- https://code.visualstudio.com/api/language-extensions/programmatic-language-features
- https://code.visualstudio.com/api/references/vscode-api#languages.registerHoverProvider