Artemis: Refactor Primes Class for Enhanced Efficiency and Code Quality

[mike-turintech]

This pull request introduces significant optimizations and improvements to the Primes class. Key changes include:

• Imports Updated: Switched from java.util.Vector to java.util.ArrayList for better performance and flexibility.

• Optimized Prime Checking: The IsPrime method now checks for primality up to the square root of n, reducing unnecessary iterations and removing redundant checks.

• Adjusted SumPrimes Method: The loop in SumPrimes now starts at 2, and the sum operation has been simplified for clarity.

• Enhanced PrimeFactors Method: Updated to return an ArrayList<Integer> and optimized the logic to find prime factors using a while loop, including a check for n itself as a prime factor if applicable.

These changes collectively enhance the efficiency of prime checking and factorization processes, reduce time complexity for larger inputs, and improve code readability and maintainability.