feat(isLicensePlate): Support for Pakistani vehicles

[anasshakil]

This PR adds support for Pakistani vehicles license plates.

const isValid = isLicensePlate('IDS 7871', 'en-PK'); // valid

Supported formats

• X YYYY
• XXX YYY
• XXX-YYY
• XXX YYYY
• XXYYYY
• XX YYY
• XXYYY
• XXX YYYY YY
• XXX YYY-YY
• XXX-YYY-YY
• XXXX YYYY YY

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)
• References provided in PR (where applicable)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.05 ⚠️

Comparison is base (cb91971) 100.00% compared to head (65ce01a) 99.95%.

Additional details and impacted files

@@             Coverage Diff             @@
##            master    #2207      +/-   ##
===========================================
- Coverage   100.00%   99.95%   -0.05%     
===========================================
  Files          106      107       +1     
  Lines         2348     2406      +58     
  Branches       593      604      +11     
===========================================
+ Hits          2348     2405      +57     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
src/lib/isLicensePlate.js	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

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[profnandaa]

Other than that, LGTM. Thanks for your contrib! 🎉