Add helper function to determine if a location is in a range

[suzizecat]

Adds SourceRange::contains(SourceLocation) allowing to know if a source location is within the boundaries of the source range.

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The objective is to know if a location is included in a range.
I assumed that the boundaries of the range are both included (hence the usage of <= and >= operators)

Please let me know if any update are required (or do not hesitate to make the changes yourself).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3ddb9b3) 93.76% compared to head (41d5cf1) 93.76%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #891   +/-   ##
=======================================
  Coverage   93.76%   93.76%           
=======================================
  Files         189      189           
  Lines       47018    47018           
=======================================
  Hits        44087    44087           
  Misses       2931     2931           

Files	Coverage Δ
include/slang/text/SourceLocation.h	100.00% <ø> (ø)

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