Update GeminiLLMService to work with LLMContext and LLMContextAggregatorPair

CHANGELOG.md

@@ -7,6 +7,59 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Expanded support for universal `LLMContext` to `GeminiLiveLLMService`.
+  As a reminder, the context-setup pattern when using `LLMContext` is:
+
+  ```python
+  context = LLMContext(messages, tools)
+  context_aggregator = LLMContextAggregatorPair(
+    context,
+    # This part is `GeminiLiveLLMService`-specific.
+    # `expect_stripped_words=False` needed when Gemini Live used with AUDIO
+    #  modality (the default).
+    assistant_params=LLMAssistantAggregatorParams(expect_stripped_words=False),
+  )
+  ```
+
+  (Note that even though `GeminiLiveLLMService` now supports the universal
+  `LLMContext`, it is not meant to be swapped out for another LLM service at
+  runtime.)
+
+  Worth noting: whether or not you use the new context-setup pattern with
+  `GeminiLiveLLMService`, some types have changed under the hood:
+
+  ```python
+  ## BEFORE:
+
+  # Context aggregator type
+  context_aggregator: GeminiLiveContextAggregatorPair
+
+  # Context frame type
+  frame: OpenAILLMContextFrame
+
+  # Context type
+  context: GeminiLiveLLMContext
+  # or
+  context: OpenAILLMContext
+
+  ## AFTER:
+
+  # Context aggregator type
+  context_aggregator: LLMContextAggregatorPair
+
+  # Context frame type
+  frame: LLMContextFrame
+
+  # Context type
+  context: LLMContext
+  ```
+
+  Also note that `LLMTextFrame`s are no longer pushed from `GeminiLiveLLMService`
+  when it's configured with `modalities=GeminiModalities.AUDIO`. If you need
+  to process its output, listen for `TTSTextFrame`s instead.
+
 ### Changed
 
 - `FunctionFilter` now has a `filter_system_frames` arg, which controls whether