support part of language server

[asukaminato0721]

Is your feature request related to a problem? Please describe.

currently missing the lint and formatter.

Describe the solution you'd like

language server provided a lot of functionalities, so integrate it may make senses.

https://microsoft.github.io/language-server-protocol/implementors/servers/

Additional context
Add any other context or screenshots about the feature request here.

[JerryI]

Related

https://github.com/FurqanSoftware/codemirror-languageserver

[JerryI]

Formatter is reachable from the command palette. But it is quite far from being perfect ;)

[JerryI]

Then we need a minimal working example with CodeMirror 6 editor (static html file) connected (via web sockets) to lsp https://github.com/WolframResearch/LSPServer