Event log settings to be implemented by storage providers.
Delay between two tries to physically delete all requested events while keeping
those that are not yet replicated.
Delay between clock recovery retries.
Maximum number of clock recovery retries.
Maximum number of events to store per partition.
Maximum number of events to store per partition. If a storage provider does not support
partitioned event storage it should return Long.MaxValue, otherwise the appropriate
partition size. Eventuate internally calculates the target partition for batch writes.
If an event batch doesn't fit into the current partition, it will be written to the next
partition, so that batch writes are always single-partition writes.