Make termination condition config declarative

[victordibia]

Why are these changes needed?

Step 1 in making components in agentchat natively declarative.

from autogen_agentchat.conditions import StopMessageTermination, MaxMessageTermination 

max_term = MaxMessageTermination(5)
stop_term = StopMessageTermination() 

or_term = max_term | stop_term
print(or_term.dump_component() )
 
print(max_term.dump_component())

Results

ComponentModel(provider='autogen_agentchat.base._termination._OrTerminationCondition', 
component_type='termination', version=1, component_version=1, description=None, 
config={'conditions': [{'provider': 'autogen_agentchat.conditions.MaxMessageTermination', '
component_type': 'termination', 'version': 1, 'component_version': 1, 
'config': {'max_messages': 5}}, {'provider': 'autogen_agentchat.conditions.StopMessageTermination', 
'component_type': 'termination', 'version': 1, 'component_version': 1, 'config': {}}]})

ComponentModel(provider='autogen_agentchat.conditions.MaxMessageTermination', 
component_type='termination', version=1, component_version=1, 
description=None, config={'max_messages': 5})

Related issue number

Closes #4983

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.86%. Comparing base (9570e82) to head (9cc873d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4984      +/-   ##
==========================================
+ Coverage   68.53%   68.86%   +0.33%     
==========================================
  Files         156      156              
  Lines       10140    10252     +112     
==========================================
+ Hits         6949     7060     +111     
- Misses       3191     3192       +1     

Flag	Coverage Δ
unittests	68.86% <100.00%> (+0.33%)	⬆️

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[ekzhu]

Looks good! Just to make sure, we will use the override for a cleaner provider path right?