Add French ZIP/Postal Code

[zessx]

Ranges:

• 00000 to 00999: army exclusive usage
• 01000 to 95999: metropolitan zip codes
• 97000 to 97999: overseas department (DOM)
• 98000 to 98999: overseas territory (TOM)
• 99000 to 99999: reserved for special service "La Poste Paris Entreprise"

Special cases:

• 29Sxx and 29Nxx (Finistère) no longer exist since 1972, but are supported by this regex
• 2Axxx and 2Bxxxx (Corse) don't exist as zip codes (they are both merged into 20xxx)
• 96xxx is the only range unused in French zip codes