Merge https://github.com/google/adk-python/pull/2206
### Summary
This PR adds support for `ContextWindowCompressionConfig` in `RunConfig`.
This enables context window compression using a `trigger_tokens` threshold and a sliding window with a `target_tokens` limit.
This feature is useful for managing long-running audio inputs.
### Related Issue
Closes#2188
### Testing Plan
- Added new unit test: `test_streaming_with_context_window_compression_config`
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/2206 from ac-machache:support/add-context-compression-config c8a5b15cae2d2b72f331797d07ae0bbaf977ed3c
PiperOrigin-RevId: 819855786
The old live/bidi agents are using a cache to store context/history during agent transfer etc. As we have added support for session for live/bidi, we are now migrating the context/history cache to it. This improves scalability, efficiency and maintainability.
It introduces several changes:
* AudioTranscriber support is removed as now we are using native transcription from models.
* Transcription is returned as input_transcription/output_transcription fields and no longer as contents.
* We will return a new event with artifact references of file type of audio/pcm.(in addition to existing audio response event. So the users of this api need to do proper filtering here.)
PiperOrigin-RevId: 805997675
This commit adds support for the session resumption configuration in the run_config.
The SessionResumptionConfig is added to RunConfig to allow the user to set up a configuration for session resumption(only transparent mode for now).
There are two modes of session resumption: manual and transparent. In manual mode, you have to manually bookkeeping the session information and restarts the session which is tricky to do right now. In transparent mode, the server does the bookkeeping for you and no hassle on ADK side. For now, the transparent mode should be enough.
Also, added the relevant unit tests to check that every possible configuration is set properly and the run_config is correctly populated.
This is needed for supporting the new session resumption feature.
PiperOrigin-RevId: 786549455
machacheandCopybara-Service
Hangfei LinandCopybara-Service