Add support for combinations of termination conditions in AGS

[victordibia]

Currently, you can only specify one termination condition in AGS.

"termination_condition": {
    "component_type": "termination",
    "termination_type": "MaxMessageTermination",
    "max_messages": 10
  }

However, AgentChat supports combinations of termination conditions

termination = termination = MaxMessageTermination(3) | TextMentionTermination("stop")

What

Extend AGS component factory and spec to support combinations of termination conditions

 "termination_condition": {
    "component_type": "termination",
    "termination_type": "CombinationTermination",
    "operator": "or",
    "conditions": [
      {
        "component_type": "termination",
        "termination_type": "TextMentionTermination",
        "text": "TERMINATE"
      },
      {
        "component_type": "termination",
        "termination_type": "MaxMessageTermination",
        "max_messages": 1
      }
    ]
  }