Adds a new peer to the session if they are supported and are either not already in the session and have not been evicted previously.
Optionaloptions: AbortOptionsOptionalannounceMake a new block available to peers
Optionaloptions: BlockAnnounceOptions<AnnounceProgressEvents>OptionalcreateCreate a new session
Optionaloptions: CreateSessionOptions<RetrieveProgressEvents>OptionalretrieveRetrieve a block from a source
Optionaloptions: BlockRetrievalOptions<RetrieveProgressEvents>
The name of the block broker, used for logging purposes