Reorganize the repository to facilitate the move to a monorepo

[nblagoev]

Description

• Reorganize the repository and use NPM Workspaces to facilitate the move to a monorepo for hosting the vRBT components as they become open source.
• Split the extension into 3 package.json files - root (extension), vro-language-server and vrdt-common.
• Publish vro-language-server and vrdt-common to the GitHub Packages registry.
• Bundle the extension using webpack.
• Fix regression that caused language server to not start for legacy (XML/JS) projects. Downgrade to language server 6.x dependency.

Release Notes

• Bundle the extension using Webpack to reduce its size by 8x.
• Fix regression that caused language server to not start for legacy (XML/JS) projects.

[codecov]

Codecov Report

Merging #99 (3b5b8b5) into master (e8b7735) will increase coverage by 0.00%.
The diff coverage is 95.45%.

@@           Coverage Diff           @@
##           master      #99   +/-   ##
=======================================
  Coverage   50.12%   50.12%           
=======================================
  Files          42       40    -2     
  Lines         806      788   -18     
  Branches      113      112    -1     
=======================================
- Hits          404      395    -9     
+ Misses        400      391    -9     
  Partials        2        2