Add option to enable/disable Razor formatter

[ajaybhargavb]

https://github.com/dotnet/aspnetcore/issues/14271

[NTaylorMullen]

Looks good. I'd hold the PR until we get the rest of the Razor changes in for this release though in the case that O# does a release before us.

[codecov]

Codecov Report

Merging #3579 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #3579   +/-   ##
======================================
  Coverage    89.8%   89.8%           
======================================
  Files          59      59           
  Lines        1589    1589           
  Branches       89      89           
======================================
  Hits         1427    1427           
  Misses        151     151           
  Partials       11      11

Flag	Coverage Δ
#integration	100% <ø> (ø)	⬆️
#unit	89.8% <ø> (ø)	⬆️

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[ajaybhargavb]

Closing as this is covered by #3594