added logic to extract text from ThinkingBlock

[ManuelPeixotoCegid]

This pull request updates the handling of Anthropic message responses by supporting the new ThinkingBlock type introduced in Anthropic version 0.23.1 and improving the extraction logic for JSON responses. The changes ensure that the code can correctly parse both TextBlock and ThinkingBlock content types.

Support for new Anthropic content types:

• Imported the ThinkingBlock type from anthropic.types to enable handling of messages that use this new block type.

Improved response extraction logic:

• Updated the _extract_json_response method in autogen/oai/anthropic.py to check the type of the first item in the response.content list, extracting text from TextBlock or thinking from ThinkingBlock as appropriate.

[CLAassistant]

All committers have signed the CLA.

[randombet]

@ManuelPeixotoCegid Could you add a test to cover this part?

[randombet]

@ManuelPeixotoCegid Could you share your contacts (discord or email) that I could follow up on this? And could you sign the Contributor License Agreement?

[ManuelPeixotoCegid]

@randombet reachout to me at mapeixoto@cegid.com and I have just signed it :)

[codecov]

Codecov Report

❌ Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
autogen/oai/anthropic.py	14.28%	6 Missing ⚠️

Files with missing lines	Coverage Δ
autogen/oai/anthropic.py	23.61% <14.28%> (-0.34%)	⬇️

... and 41 files with indirect coverage changes

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[randombet]

@ManuelPeixotoCegid Could you address the comments and add the test?