feat: LG LSP in Composer

[zhixzhan]

Description

LG language server protocol (LSP) implementation for composer.

inline editor enhance

for inline editing, we no longer hideArea in editor, we put partial code on client, and the rest on language server, validation/completion/hover.. will be calculated from a combination file cross client and server.

Task Item

closes #1485
closes #1635
closed #1628
closed #1482

Type of change

Please delete options that are not relevant.

• Code refactor (non-breaking change which improve code quality, clean up, add tests, etc)
• New feature (non-breaking change which adds functionality)

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have functionally tested my change

Screenshots

[zhixzhan]

@zhixzhan Found one issue with the syntax highlighting,

in inline mode, the structured lg isn't highlighted

but in all up view, it works well

can you check with @cosmicshuai again?

ok I will take a look

[boydc2014]

Looks good to me now, @cwhitten @a-b-r-o-w-n can you help take a look again?

stale