[FEATURE REQUEST] To Implement Base64 conversion of a text

[NithinU2802]

What would you like to Propose?

I would like to add a Base64 implementation to the repository. Base64 is an important and widely used algorithm that allows safe conversion of binary data to text and back, making it essential for authentication, data storage, file transmission, and secure communication.

Ref: https://en.wikipedia.org/wiki/Base64

Issue details

The implementation will include:

1. A Base64Util class with encode and decode methods.
2. Unit tests covering valid input, invalid input, and edge cases.

Additional Information

I’m adding this algorithm in the Conversion folder as it provides functionality to convert text to Base64 format and also reverse it back to the original text.

[NithinU2802]

Implemented in #6586