ContentKey based filter in the Nessie Diff API

[harshm-dev]

Description: The current diff API brings the differences in all content keys between the two perimeters. The request is to allows a filter that restricts the search operation for a specific ContentKey.
The DBAdapter implementation is already equipped to take KeyFilterPredicate parameter. So, the ask to expose the same at upper layers (version store / APIs etc).

Requested Changes in public API: Extend diff API to support filter options on the content key

• Changes in REST API
• Changes in Java Client API
• Changes in Python Client API
• Changes in SQL extentions

Expected Use Cases: Skip compaction on unchanged tables

[dimas-b]

This is a general enhancement (applies to API v1 as well as to v2), so I'm moving it out of the scope of #5112, which contains only the tasks required to achieve a releasable API v2 covering existing v1 functionality (where possible).