feat(isMobilePhone): added Papua New Guinea mobile number validation

[kai2128]

Added Papua New Guinea mobile number validation (en-PG)
references:

• Telephone numbers in Papua New Guinea
• International Telecommunication Union

Checklist

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

[codecov]

Codecov Report

Merging #2002 (ceeb7b2) into master (8f04ca9) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #2002   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          104       104           
  Lines         2108      2108           
  Branches       475       475           
=========================================
  Hits          2108      2108           

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

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[rubiin]

Thankyou for the contribution 🎉