[MongoDB] postImages

[rkistner]

This adds an option to use MongoDB postImages when replicating changes, to get proper consistency of updates.

For what this means, see: https://www.mongodb.com/docs/v6.0/reference/command/collMod/#change-streams-with-document-pre--and-post-images

Since this can be a breaking change for existing instances, it is not automatically enabled.

There are three valid options:

1. post_images: off: The current behavior and the default to prevent breaking existing instances. This may produce updates out of order.
2. post_images: read_only: This requires changeStreamPreAndPostImages: { enabled: true } to be set on every collection that is referenced in sync rules, otherwise replication will error. Ideal when permissions are restricted.
3. post_images: auto_configure: This automatically configures the changeStreamPreAndPostImages option on collections if needed. Requires the collMod permission.

TODO:

• Proper naming of options
• Handle cases where document postImages have expired, or have only been enabled after the start of the changestream (will need to restart replication).
• Add check in diagnostics/validation API.

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