Send DeployProcessed events to event stream server for historical blocks

[piotr-dziubecki]

We want to replace BlockSynchronizerAnnouncement::CompletedBlock announcement with a hot block announcement, where the hot block state is set up so that only the following events are emitted:

• deploy_buffer::Event::Block
• consensus::Event::BlockAdded
• event_stream_server::Event::BlockAdded
• event_stream_server::Event::DeployProcessed for each deploy (this will mean the BlockSynchronizer will need to read the corresponding execution results from storage, or retain them in memory)

We also have some nitpicks to resolve:

• rename hot block to meta block
• rename State::new_synced() to new_already_stored()
• remove State::immediate_switch_block_for_current_protocol_version and rename State::new_immediate_switch() to new_should_not_gossip()