adding PAN Card number in Indian local flavor

[vishalpandeynits]

Added permanent account number field in indian localflavor. PAN Cards are issued by the government of India to every taxpayer.

All Changes

• [x] Add an entry to the docs/changelog.rst describing the change.

New Fields Only

• [x] Prefix the country code to all fields.

• [x] Field names should be easily understood by developers from the target localflavor country. This means that English translations are usually not the best name unless it's for something standard like postal code, tax / VAT ID etc.

[vishalpandeynits]

A gentle request to review this pull request @benkonrath. You can visit these two websites for more information about Indian Permanent account number cards. Wikipedia: https://en.wikipedia.org/wiki/Permanent_account_number Income tax department, India: https://www.incometaxindia.gov.in/tutorials/1.permanent%20account%20number%20(pan).pdf

[vishalpandeynits]

Thank you @benkonrath for helping me in my baby steps of open source contribution.