Text Compression Transform

[WaelKarkoub]

Why are these changes needed?

This PR introduces text compression by leveraging the LLMLingua library. This addition enhances processing efficiency and response speed by reducing token usage in large language models.

NOTE: LLM lingua uses locally hosted models, so caching might be important here.

Future work:

• Image Compression
• Video Compression

Related issue number

Closes #2538

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.96154% with 77 lines in your changes are missing coverage. Please review.

Project coverage is 45.11%. Comparing base (ded2d61) to head (ec6fe57).
Report is 35 commits behind head on main.

Files	Patch %	Lines
...togen/agentchat/contrib/capabilities/transforms.py	20.23%	67 Missing ⚠️
...agentchat/contrib/capabilities/text_compressors.py	50.00%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2225       +/-   ##
===========================================
+ Coverage   33.33%   45.11%   +11.77%     
===========================================
  Files          83       86        +3     
  Lines        8636     9108      +472     
  Branches     1835     2090      +255     
===========================================
+ Hits         2879     4109     +1230     
+ Misses       5516     4651      -865     
- Partials      241      348      +107     

Flag	Coverage Δ
unittest	12.61% <25.96%> (?)
unittests	44.36% <0.00%> (+11.03%)	⬆️

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