Add French PII patterns (INSEE/NIR, phone, IBAN)

[wan9yu]

Add French PII detection patterns.

PII types to add:

• INSEE/NIR (social security): 13 digits + 2 digit key
• Phone: +33 X XX XX XX XX
• French IBAN: FR76 XXXX XXXX XXXX XXXX XXXX XXX

See CONTRIBUTING.md for the step-by-step guide.