Extract `ReplicationConfigModule`

Move configuration related bindings to a specialized
`ReplicationConfigModule`. This hides implementation details like
conditional bindings based on the configuration options.

Additionally this will also limit the impact on the `pull-replication`
plugin when we decide to move around configuration classes or add new
configuration related functionality.

Change-Id: I2fa409cdf19079a0c05a9b0612847bd2be2527f1