Add CSV language

[spenserblack]

This pull request adds the language...

• If this language conflicts with another language (same extension), I've added heuristics
• If this language conflicts with another language, I've linked to the pull request that added the other language here:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2b474f8) 86.44% compared to head (9d61afc) 86.44%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #277   +/-   ##
=======================================
  Coverage   86.44%   86.44%           
=======================================
  Files          17       17           
  Lines         605      605           
=======================================
  Hits          523      523           
  Misses         82       82           

Flag	Coverage Δ
	86.44% <ø> (ø)
macOS-latest	85.85% <ø> (-0.34%)	⬇️
ubuntu-latest	81.44% <ø> (ø)
windows-latest	74.87% <ø> (ø)

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