[pruner] keep last N epochs of objects data

[phoenix-o]

the current version of pruner is implemented in an aggressive fashion: it subscribes to executed checkpoint stream and removes all previous object versions. This allows to remove stale data ASAP, but doesn’t work well with the following use cases:

• in future iterations of the product, indexer will need a reasonable time window to access old versions of objects
• we might need to delay pruning for debugging purposes

This PR changes the flow to keep old object versions for the last N epochs of data and makes the parameter configurable. To simulate aggressive behaviour it can be set to 0

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