feat: add as_generic_chat_history function to convert ant Context to …

[akihikokuroda]

Misc PR

Type of PR

• Bug Fix
• New Feature
• Documentation
• Other

Description

• Link to Issue: Fix: fix: as_chat_history is outdated and functionality doesn't match it's name #932

Add as_generic_chat_history() function to handle heterogeneous contexts with
configurable formatter. Unlike as_chat_history(), this gracefully handles
arbitrary component types by converting them to strings, with optional logging
for unknown types.

• as_generic_chat_history(ctx, formatter=None) converts any Context to Messages
• Default formatter logs warnings for unknown component types
• Support custom formatter parameter for domain-specific type handling
• Handle ModelOutputThunk, CBlock, and arbitrary components seamlessly
• CBlock → Message(role="user"), MOT → Message(role="assistant")
• Add 7 comprehensive tests covering all conversion scenarios

Testing

• Tests added to the respective file if code was changed
• New code has 100% coverage if code as added
• Ensure existing tests and github automation passes (a maintainer will kick off the github automation when the rest of the PR is populated)

Attribution

• AI coding assistants used: claude

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