[Experimental] aact-based Based Agent

[ProKil]

The first step of #188: Implementing an aact-based BaseAgent.

📑 Description

A new BaseAgent class using aact's Node API. Please check out examples and doc for usage

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed
• Branch name follows type/descript (e.g. feature/add-llm-agents)
• Ready for code review

ℹ Additional Information

[codecov]

Codecov Report

Attention: Patch coverage is 95.29412% with 4 lines in your changes missing coverage. Please review.

Project coverage is 72.88%. Comparing base (78a8c27) to head (7c467d7).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
tests/experimental/test_agent.py	93.02%	3 Missing ⚠️
sotopia/experimental/agents.py	97.50%	1 Missing ⚠️

@@            Coverage Diff             @@
##             main     #221      +/-   ##
==========================================
+ Coverage   72.22%   72.88%   +0.65%     
==========================================
  Files          55       58       +3     
  Lines        2888     2972      +84     
==========================================
+ Hits         2086     2166      +80     
- Misses        802      806       +4     

Files with missing lines	Coverage Δ
sotopia/envs/parallel.py	77.71% <ø> (-0.13%)	⬇️
sotopia/experimental/__init__.py	100.00% <100.00%> (ø)
sotopia/renderers/xml_renderer.py	92.10% <ø> (-0.21%)	⬇️
sotopia/experimental/agents.py	97.50% <97.50%> (ø)
tests/experimental/test_agent.py	93.02% <93.02%> (ø)

... and 1 file with indirect coverage changes