feat: playgrounds in JS VSCODE-372

[alenakhineika]

Description

Make playgrounds become proper JavaScript environments.

• Update syntaxes.
  • Replace the MongoDB-TmLanguage grammar with the MongoDB injection grammar.
  • Modify the update-grammar script to update the MongoDB injection grammar with the most recent DevTools constants during the build process.
• Activate the extension on javascript and plaintext languages.
  • Refactor activation events.
  • For playgrounds opened from the disc set JavaScript language to the document.
• Identify playgrounds based on the document path.
  • Implement the isPlayground util function that will identify playgrounds among other JavaScrip files.
  • Refactor all places that check for mongodb language id and replace it with isPlayground check.
• Create playgrounds as JavaScript documents.
  • Create playgrounds by the document UID.
  • Apply required changes to all templates based on playgrounds functionality (clone document, insert document, create collection, create index, search).
• Declare global variables in playground templates to resolve linting errors.
• Show the “Run Playground” button only for MongoDB playgrounds and hide it for regular JavaScript files in a workspace.
• Show Active Connection CodeLens only for MongoDB playgrounds and hide it for regular JavaScript files in a workspace.
• Show Playground Selected CodeAction only for MongoDB playgrounds and hide it for regular JavaScript files in a workspace.
• Update the Language Server to work with JavaScript documents.

Checklist

• New tests and/or benchmarks are included
• Documentation is changed or added

Motivation and Context

• Bugfix
• New feature
• Dependency update
• Misc

Open Questions

Dependents

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)

[mmarcon]

@alenakhineika Notes from a quick test:

• I don't think we have this today, but can we add use and db to the autocompleteter? Is it easy enough? I think it's extra important to do it now because VS Code in a JS file (at least for me) changes use to URLSearchParams (see gif below)
• Inside a query or aggregation (at least where we can tell we are inside a query or an aggregation), can we make sure that the MongoDB completions show up before anything else? For example, if I type db.movies.find({ it would be ideal if field names and MongoDB keywords (the $ things) would show up before other "JS things"

[alenakhineika]

@mmarcon absolutely agree it would be very useful! Created tickets:

VSCODE-380 - Suggest use and db commands
VSCODE-382 - Show MongoDB completion items before other JS completion

[Anemy]

Nice, going to give this a try on local now, left a couple comments.