feat(isMobilePhone): Added regex for Wallis and Futuna fr-WF

Added Wallis and Futuna mobile number validation (fr-WF)

References:

• Wikipedia
• International Telecommunication Union

Checklist

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

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