Proto.Actor persistence move from Action<object> callback to Action<object, long> callback where long is the index of the read event

[codrut51]

Persistence.cs use callback with index
At times certain persistence options don't allow you to delete an event and a common way to deal with this is to read the stream in memory, delete the stream, remove the desired event, and persist the stream.
Some storages such as SQL or EventStoreDB will continue the index count from where it left resulting quite often in version conflicts
i am attempting to solve this issue/bug/inconvenience via a PR