5.1 release plan

[krassowski]

Wishlist:

• add new features:
  • symbol navigation (sidebar panel, + modal) Implement navigation to symbol (workspace/symbol) #43 - it may go directly upstream
  • formatting
  • code actions and commands (How to invoke executable commands for an LSP server #676)
• typdoc documentation
• deprecate .lsp-symlink and prefer DAP source request (we cannot drop it as most kernels do not support DAP), reusing Open files from errors jupyterlab/jupyterlab#13390)
• multiple language servers per document (will close Support for jedi-language-server code diagnostics configuration #437)
• Manually re-launching LSP servers #681