feat(isMobilePhone): add American Samoa (en-AS)

[whoalin1]

Summary

Refs #1761

Add en-AS (American Samoa) to isMobilePhone.

Test plan

• npm test -- -g isMobilePhone
• Valid samples in en-AS block pass; invalid rejected

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9ff3424) to head (ef4262b).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2919   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          114       114           
  Lines         2599      2599           
  Branches       658       658           
=========================================
  Hits          2599      2599           

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