feat: Add RLE and Shannon-Fano compression algorithms

[Microindole]

Description

Add two new lossless compression algorithms to the project:

• Run-Length Encoding (RLE)
• Shannon-Fano Coding

Changes

• Added compression/RunLengthEncoding.java
• Added compression/ShannonFano.java
• Added comprehensive test cases for both algorithms

Closes #6778

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.54%. Comparing base (b50d1d0) to head (c457a83).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6779      +/-   ##
============================================
+ Coverage     77.46%   77.54%   +0.07%     
- Complexity     6268     6293      +25     
============================================
  Files           726      728       +2     
  Lines         20914    20976      +62     
  Branches       4076     4086      +10     
============================================
+ Hits          16201    16265      +64     
+ Misses         4077     4076       -1     
+ Partials        636      635       -1     

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[DenizAltunkapan]

Thank you @Microindole