message: fix contextChanged event typing
diff: @@ -69,7 +69,8 @@ export interface ICodeAllowList {
  export interface IContainerEvents extends IEvent {
  (event: "readonly", listener: (readonly: boolean) => void): void;
  - (event: "connected" | "contextChanged", listener: (clientId: string) => void);
  + (event: "connected", listener: (clientId: string) => void);
  + (event: "contextChanged", listener: (codeDetails: IFluidCodeDetails) => void);
  (event: "disconnected" | "joining", listener: () => void);
  (event: "closed", listener: (error?: CriticalContainerError) => void);
  (event: "warning", listener: (error: ContainerWarning) => void);
  