PanelToSDKMessage is a message sent from the Devtools panel to the SDK.
Informs the SDK that the panel is available.
Informs the SDK that the panel is not available.
Informs the SDK that the panel is interested in receiving the "event" for the document, starting with the initial "full sync" event.
PanelToSDKMessage is a message sent from the Devtools panel to the SDK.