Source: Restart from a given state / offset

It should be possible to specify to the source connector where to start from regarding the Couchbase mutations. The following should be possible:

• Restart from oldest available mutation in Couchbase (ignore any potential saved state);
• Restart from current Couchbase state (ignore any potential saved state);
• Restart from saved state, and if none, restart from oldest available mutation in Couchbase;
• Restart from saved state, and if none, restart from current Couchbase state.