feat: add RSA encryption and decryption algorithm

[QuantumSoham]

This PR implements the RSA encryption and decryption algorithm under the Ciphers section.
It includes:

RSA key generation

Encryption and decryption functions

Unit tests written with Vitest

The algorithm follows the project's coding guidelines, naming conventions, and test structure.

✅ All tests pass locally.
✅ Code is formatted with Prettier.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.11321% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.94%. Comparing base (1d252d7) to head (d69172b).

Files with missing lines	Patch %	Lines
Ciphers/RSAAlgorithm.js	98.11%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1775      +/-   ##
==========================================
+ Coverage   85.87%   85.94%   +0.06%     
==========================================
  Files         377      378       +1     
  Lines       19720    19826     +106     
  Branches     3005     3019      +14     
==========================================
+ Hits        16935    17039     +104     
- Misses       2785     2787       +2     

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