implements /_api/replication/sync.
not support yet.
define all replication event type.
add support API: /_api/replication/server-id (getReplicationServerId)
add support API: /_api/replication/logger-start
(startReplicationLogger)
add support API: /_api/replication/logger-stop (stopReplicationLogger)
add support API: GET /_api/replication/logger-config
(getReplicationLoggerConfig)
add support API: PUT /_api/replication/logger-config
(setReplicationLoggerConfig)
callback getReplicationDump also handles x-arango-replication-xx header.