feat(compression): Add LZW and Arithmetic Coding algorithms

[Microindole]

Description

This PR adds two fundamental lossless compression algorithms to the compression category:

• LZW (Lempel–Ziv–Welch)
• Arithmetic Coding

Both implementations are accompanied by comprehensive JUnit tests to ensure correctness and handle edge cases.

Related Issue

Closes #6798

Checklist

• I have read the contribution guidelines.
• I have tested my code.
• I have followed the code style of the project.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.53086% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.93%. Comparing base (a7f0bab) to head (30f9570).

Files with missing lines	Patch %	Lines
...om/thealgorithms/compression/ArithmeticCoding.java	95.55%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## master #6799 +/- ## ============================================ + Coverage 77.85% 77.93% +0.07%  - Complexity 6397 6420 +23  ============================================ Files 734 736 +2 Lines 21363 21444 +81 Branches 4185 4198 +13 ============================================ + Hits 16633 16712 +79  Misses 4061 4061 - Partials 669 671 +2 

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