callbacks - no longer passed around

[pgrayy]

Description

Each component in Strands now yields callback events to the Agent class, which in turn passes the events to the configured callback handler. In short, Agent class now holds the only reference to the callback handler. I am updating the docs to reflect this change in logic.

Type of Change

• New content addition
• Content update/revision
• Structure/organization improvement
• Typo/formatting fix
• Bug fix
• Other (please describe):

Motivation and Context

Accuracy on the details of Strands' implementation.

Checklist

• I have read the CONTRIBUTING document
• My changes follow the project's documentation style
• I have tested the documentation locally using mkdocs serve
• Links in the documentation are valid and working
• Images/diagrams are properly sized and formatted
• All new and existing tests pass

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