Make the DBAL event store table name configurable.

There is now a bundle configuration option under
```
broadway:
    event_sourcing:
        dbal_event_store:
            table_name: my_events
```
Defaults to `events`.

Fixes https://github.com/qandidate-labs/broadway/issues/90
Agreed, I would prefer `setParameter` over `replaceArgument`