feat: convert client tool call events to public type

[ao-anam]

Summary by cubic

Convert WebRTC client tool call events to a camelCase public ClientToolEvent, ensuring a consistent API shape for consumers. StreamingClient now converts and emits the public event while keeping the internal WebRTC event for internal listeners.

• Refactors

  • Added ToolCallManager to convert WebRtcClientToolEvent -> ClientToolEvent.
  • StreamingClient emits InternalEvent.WEBRTC_CLIENT_TOOL_EVENT_RECEIVED with WebRtcClientToolEvent, then emits AnamEvent.CLIENT_TOOL_EVENT_RECEIVED with ClientToolEvent.
  • ClientToolEvent fields changed to camelCase; removed used_outside_engine.
  • Updated InternalEventCallbacks to use WebRtcClientToolEvent for the internal event.

• Migration

  • Update consumers to use camelCase fields: eventUid, sessionId, eventName, eventData, timestamp, timestampUserAction, userActionCorrelationId.
  • used_outside_engine is no longer present on the public ClientToolEvent.

^{Written for commit f3cc5a2. Summary will update automatically on new commits.}

[cubic-dev-ai]

No issues found across 7 files