PR: Use pygls for json-rpc language client and add support for lsprotocol

[hlouzada]

Description of Changes

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)

• Included a screenshot or animation (if affecting the UI, see Licecap)

This pull request refactors and updates the LSP client provider infrastructure to support direct use of lsprotocol types, simplifying and clarifying decorator logic, and improving the handling and routing of LSP messages and responses by using pygls client:

• The decorators send_request, send_notification, and send_response are now marker decorators that tag methods with LSP method names and kinds, instead of wrapping them to send messages directly. The actual sending is now centralized in LSPClient.perform_request(), and the class_register decorator builds registries for handlers and senders, enabling dynamic dispatch.

• All LSP message construction and handling in providers (client.py, window.py, workspace.py) now use lsprotocol types instead of manually constructed dictionaries. This ensures better type safety and protocol compliance.

• Updated the WorkspaceProvider code for handling workspace folder changes, watched files, and edits to support new types and more robustly assigns results to the correct workspace instances.

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