feat(compression): Add LZ77 and LZ78 algorithms

[Microindole]

Description

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

1. LZ77 (Lempel–Ziv 77): Implements compression using a sliding window approach.
2. LZ78 (Lempel–Ziv 78): Implements compression using a dynamically built dictionary.

Both implementations include compress and decompress methods and are accompanied by comprehensive JUnit tests (LZ77Test.java, LZ78Test.java) to ensure correctness and handle edge cases like empty or null inputs.

Adding these algorithms enriches the compression package by providing classic examples of dictionary-based coding, complementing the existing LZW algorithm.

Related Issue

Closes #6909

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.06%. Comparing base (f66da5e) to head (ff709e9).

Additional details and impacted files

@@ Coverage Diff @@ ## master #6910 +/- ## ============================================ + Coverage 77.98% 78.06% +0.08%  - Complexity 6436 6466 +30  ============================================ Files 736 738 +2 Lines 21499 21585 +86 Branches 4201 4220 +19 ============================================ + Hits 16765 16850 +85  Misses 4063 4063 - Partials 671 672 +1 

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