Added support for multi root workspaces with the new language server server

[karrtikr]

For #3008

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Has a news entry file (remember to thank yourself!)
• Has sufficient logging.
• Has telemetry for enhancements.
• Unit tests & system/integration tests are added/updated
• Test plan is updated as appropriate
• package-lock.json has been regenerated by running npm install (if dependencies have changed)

[codecov]

Codecov Report

Merging #4244 into master will increase coverage by 22%.
The diff coverage is 74%.

@@           Coverage Diff            @@
##           master   #4244     +/-   ##
========================================
+ Coverage      56%     78%    +22%     
========================================
  Files         361     438     +77     
  Lines       15274   20390   +5116     
  Branches     2373    3273    +900     
========================================
+ Hits         8494   15721   +7227     
+ Misses       6236    4665   -1571     
+ Partials      544       4    -540

Flag	Coverage Δ
#Linux	66% <50%> (?)
#Windows	67% <50%> (?)
#macOS	66% <50%> (?)