Unicode escape sequence in queries

[mdm-code]

• Simplify parser isAtEnd pointer rec. function
• Supported short and long unicode notation
• Implemented unicode escape chars in user input
• Added tests covering unicode support
• Included unicode escape seq explanation in readme

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.15%. Comparing base (6c4fbda) to head (83cf329).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   86.88%   87.15%   +0.26%     
==========================================
  Files          12       12              
  Lines         816      833      +17     
==========================================
+ Hits          709      726      +17     
  Misses         82       82              
  Partials       25       25              

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