[MongoDB] Skip current_data storage

[rkistner]

Builds on #121.

The current_data bucket storage collection stores the following data:

• buckets: The current set of buckets for each replicated row
• lookups: Current parameter query lookups for each replicated row
• data: A copy of the current data

Buckets and lookups are used to be able to do REMOVE operations (need to know in which buckets a row was before, so we know from which buckets we need to remove it from after an update).

The data bit is to support partial updates. For Postgres, this could be when we receive an update with unchanged TOAST columns. However, for MongoDB we get the full document on each update, so never need that. This adds an optimization for MongoDB to skip that persistence.

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Latest commit: 0db1a98

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