feat: add support for Cambodia (km-KH) mobile validation

[m-chouhan]

Added validation support for Cambodia mobile numbers.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (784e52a) to head (4f8b432).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2657   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          114       114           
  Lines         2572      2572           
  Branches       651       651           
=========================================
  Hits          2572      2572           

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