[EXPERIMENT] claude thinking model support

[aconchillo]

Please describe the changes in your PR. If it is addressing an issue, please reference that as well.

This is just an experiment to get Claude reasoning models working.

[codecov]

Codecov Report

❌ Patch coverage is 45.00000% with 22 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...t/processors/aggregators/llm_response_universal.py	42.85%	12 Missing ⚠️
src/pipecat/frames/frames.py	60.00%	6 Missing ⚠️
src/pipecat/services/anthropic/llm.py	0.00%	4 Missing ⚠️

Files with missing lines	Coverage Δ
src/pipecat/services/anthropic/llm.py	31.34% <0.00%> (-0.33%)	⬇️
src/pipecat/frames/frames.py	85.58% <60.00%> (-0.72%)	⬇️
...t/processors/aggregators/llm_response_universal.py	64.64% <42.85%> (-1.23%)	⬇️

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