Types
BroadcastSenderType
Who a broadcast is sent as. Set alongside the matching id on input: PLAIN_USER requires
senderUserId, PLAIN_WORKSPACE takes none.
enum
BroadcastSenderTypeValues
PLAIN_WORKSPACE
The workspace itself. Nobody is impersonated, so the message goes out under the workspace's own name and logo.
PLAIN_USER
A Plain user in this workspace, whose name and avatar are applied to the message.