Add Elliptic Curve Cryptography Algorithm

[xuyang471]

In this PR, I’ve added the Elliptic Curve Cryptography (ECC) algorithm to the project. The ECC class handles key generation, encryption, and decryption using elliptic curve operations. I also included classes for defining elliptic curves and points on those curves, which are essential for performing ECC computations.

Elliptic Curve Cryptography offers several advantages, including stronger security with smaller key sizes compared to other cryptographic systems like RSA. This makes ECC highly efficient in terms of computational performance, memory usage, and bandwidth, which is especially beneficial for mobile devices and environments with limited resources.

Additionally, I’ve written several unit tests to verify the encryption and decryption processes, ensure randomness in the ciphertexts, and check functionality with known values. This implementation aims to provide a simple but effective introduction to ECC for cryptographic purposes.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.52055% with 4 lines in your changes missing coverage. Please review.

Project coverage is 62.92%. Comparing base (7326ab2) to head (0d3fadf).

Files with missing lines	Patch %	Lines
src/main/java/com/thealgorithms/ciphers/ECC.java	94.52%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5700      +/-   ##
============================================
+ Coverage     62.77%   62.92%   +0.14%     
- Complexity     4025     4033       +8     
============================================
  Files           565      566       +1     
  Lines         15939    16012      +73     
  Branches       3076     3081       +5     
============================================
+ Hits          10006    10075      +69     
- Misses         5521     5523       +2     
- Partials        412      414       +2     

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[siriak]

Looks good, thanks!