feat(cartesia): make pause_frame_processing configurable in CartesiaTTSService

[jamsea]

Summary

Add pause_frame_processing parameter to CartesiaTTSService constructor to allow users to disable frame processing pausing during TTS generation.

Motivation

This is useful for use cases where:

• Text aggregation is disabled (aggregate_sentences=False)
• Users want to send text directly to the TTS service without pausing incoming frame processing
• More control over frame flow is needed for custom pipelines

Changes

• Added pause_frame_processing parameter to CartesiaTTSService.__init__() with default value True (preserving existing behavior)
• Updated docstring to document the new parameter
• Passes the parameter through to the parent AudioContextWordTTSService class

Usage

tts = CartesiaTTSService(
    api_key=os.getenv("CARTESIA_API_KEY"),
    voice_id="your_voice_id",
    aggregate_sentences=False,
    pause_frame_processing=False,  # New parameter
)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/pipecat/services/cartesia/tts.py	0.00% <ø> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[aconchillo]

I don't think we want to add a constructor argument, we simply want to set this to False.