Expose more Task-Centric Memory parameters

[rickyloynd-microsoft]

Why are these changes needed?

• Exposes a few optional memory controller parameters for more detailed control and evaluation.
• Fixes a couple formatting issues in the documentation.

Related issue number

None

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md 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]

Codecov Report

Attention: Patch coverage is 85.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 77.26%. Comparing base (ac315ef) to head (5965919).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...erimental/task_centric_memory/memory_controller.py	81.81%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6246   +/-   ##
=======================================
  Coverage   77.25%   77.26%           
=======================================
  Files         200      200           
  Lines       14256    14284   +28     
=======================================
+ Hits        11014    11036   +22     
- Misses       3242     3248    +6     

Flag	Coverage Δ
unittests	77.26% <85.00%> (+<0.01%)	⬆️

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