Support for Swedish Personal Number (Personnummer)

[blacksrc]

Description:
Currently, the package lacks support for validating Swedish Personal Numbers, commonly known as Personnummer. This feature would enhance the system's functionality by accommodating a widely-used identification format in Sweden.

Format:
A Swedish Personal Number consists of either 10 or 12 digits in the following formats:

YYYYMMDDXXXX
YYMMDDXXXX

Details:

YYYY or YY represents the birth year.
MM represents the birth month.
DD represents the birth day.
XXXX is the checksum.

Reference:
Skatteverket - Personnummer

Potential Extension:
Implementing support for the Swedish Personal Number could serve as a foundation for expanding the application's Social Security Number (SSN) validation to include various formats used in different countries.

This enhancement aligns with a broader goal of accommodating diverse identification standards, contributing to the versatility and inclusivity of the application.

[blacksrc]

I am actively working on implementing the solution for this feature request. If there are no objections or concerns raised regarding the necessity of this, I plan to submit a Pull Request (PR) promptly.

Your feedback is valuable, and I encourage any discussions or suggestions related to the proposed feature. Please feel free to share your thoughts :)