Python: Bedrock agent

[TaoChenOSU]

Motivation and Context

Address #10284

Integration of AWS Bedrock agent to SK Python

Description

1. Implementation of Bedrock agent in SK (essentially an agent connector to the Bedrock agent service).
2. A dedicated channel that works with Bedrock agents.
3. Samples on how to use Bedrock agents.

Unit and integration tests will be included in another PR to prevent this PR from becoming too big.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[markwallace-microsoft]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
semantic_kernel/agents
agent.py	57	1	98%	82
semantic_kernel/agents/bedrock
action_group_utils.py	28	28	0%	3–108
bedrock_agent.py	183	183	0%	4–585
bedrock_agent_base.py	162	162	0%	3–436
bedrock_agent_settings.py	8	8	0%	3–33
semantic_kernel/agents/bedrock/models
bedrock_action_group_model.py	8	8	0%	3–21
bedrock_agent_event_type.py	8	8	0%	3–19
bedrock_agent_model.py	11	11	0%	3–24
bedrock_agent_status.py	12	12	0%	4–23
semantic_kernel/agents/channels
bedrock_agent_channel.py	80	80	0%	3–209
chat_history_channel.py	79	2	97%	167, 170
semantic_kernel/agents/chat_completion
chat_completion_agent.py	102	7	93%	82, 85, 94–99, 124, 189
TOTAL	17596	2361	87%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3048	4 💤	0 ❌	0 🔥	1m 21s ⏱️