update CHANGELOG for new user/bot turn start strategies

changelog/3045.added.md

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+- Introducing user and bot turn start strategies. Turn start strategies indicate when user and bot turns begin. In conversational agents, these are often referred to as start/stop speaking or turn-taking plans or policies.
+
+  User turn start strategies indicate when the user starts speaking (e.g. using VAD events or when a user says one or more words).
+
+  Bot turn start strategies indicate when the bot should start speaking (e.g. using an end-of-turn detection model or by observing incoming transcriptions).
+
+  A list of strategies can be specified for both the user and the bot; strategies are evaluated in order until one evaluates to true.
+
+  Available user turn start strategies:
+    - VADUserTurnStartStrategy
+    - TranscriptionUserTurnStartStrategy
+    - MinWordsUserTurnStartStrategy
+
+  Available bot turn start strategies:
+    - TranscriptionBotTurnStartStrategy
+    - TurnAnalyzerBotTurnStartStrategy
+
+  The default strategies are:
+
+    - user: [VADUserTurnStartStrategy, TranscriptionUserTurnStartStrategy]
+    - bot: [TranscriptionBotTurnStartStrategy]
+
+  Turn start strategies are configured when setting up a `PipelineTask`. For example:
+
+  ```python
+  task = PipelineTask(..., params=PipelineParams(
+      turn_start_strategies=TurnStartStrategies(
+          bot=[
+              TurnAnalyzerBotTurnStartStrategy(
+                  turn_analyzer=LocalSmartTurnAnalyzerV3(params=SmartTurnParams())
+              )
+          ],
+      ),
+  ))
+  ```
+
+  In order to use the turn start strategies you should update to the new universal `LLMContext` and `LLMContextAggregatorPair`.

changelog/3045.deprecated.2.md

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+- ⚠️ `TransportParams.turn_analyzer` is deprecated and might result in unexpected behavior, use `PipelineTask`'s new `turn_start_strategies` parameter instead.

changelog/3045.deprecated.3.md

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+- `FrameProcessor.interruption_strategies` is deprecated, use `PipelineTask`'s new `turn_start_strategies` parameter instead.

changelog/3045.deprecated.4.md

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+- `EmulateUserStartedSpeakingFrame` and `EmulateUserStoppedSpeakingFrame` frames are deprecated.

changelog/3045.deprecated.5.md

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+- Deprecated the `emulated` field in the `UserStartedSpeakingFrame` and `UserStoppedSpeakingFrame` frames.

changelog/3045.deprecated.6.md

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+- The `LLMUserAggregatorParams` and `LLMAssistantAggregatorParams` classes in `pipecat.processors.aggregators.llm_response` are now deprecated. Use the new universal `LLMContext` and `LLMContextAggregatorPair` instead.

changelog/3045.deprecated.md

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+- `pipecat.audio.interruptions.MinWordsInterruptionStrategy` is deprecated. Use `pipecat.turns.user.MinWordsUserTurnStartStrategy` with `PipelineTask`'s new `turn_start_strategies` parameter instead.