support Language Server Protocol

[AnWeber]

add support for Language Server Protocol. The goal should be to achieve further improvements in the editing of http files.

• better support for auto completion
  • support auto completion of javascript (see vetur)
  • support auto completion of variables
• support formatting
  • formatting of http files
  • formatting of javascript
  • add linting and preview of variables
  • add auto completion of URL
  • using existing services in the project to offer completions
  • allow adding OpenAPI Specifications to support auto completion

https://code.visualstudio.com/api/language-extensions/language-server-extension-guide

[li1234yun]

The idea is very cool !!!

[henghengyang]

Looking forward to this feature 👍