feat: add bigInt function with comprehensive tests

[Daniel-Grounin]

This PR introduces the implementation of the bigInt function in the Number module.

• Added support for generating random BigInt numbers within a specific range.
• Updated unit tests to cover various scenarios, including valid ranges, negative ranges, and edge cases like same min and max values.
• All tests were run and passed successfully.

Please review the changes and let me know if there are any adjustments needed. Thank you!

• Fixed line-ending issues (CRLF/LF) that were causing changes across all lines of the files, making it hard to review. Now, only the necessary changes are visible in the diff.

[cieslarmichal]

Optional is already included above