Support hits to log count

[fragosoluana]

This PR introduces a new feature in NRTSearch for HitsLoggerPlugin that allows for logging additional hits beyond what is returned to the client.

• The system can now log more hits than are returned to the client, allowing the client to log a broader set of data without adding too much information in the search response.
• Users can configure the number of hits to be returned separately from the number of hits to be logged.
• Existing configurations will continue to function as before unless explicitly updated to use hitsToLog in LoggingHits message.

Testing

• Unit tests have been added to verify the correct behavior of the response size reduction functionalities.
• Added examples to demonstrate how to set up and utilize the new feature

[aprudhomme]

I'm not sure if this is exactly what you want here. How is hit logging expected to function when startHit is not 0? Note that topHits is applied before the startHit adjustment (unfortunately). If startHit=10, topHits=20, hitsToLog=10, would you expect to log the first 10 hits or the second 10 hits? For the latter, you would need to add startHit to hitsToLog before taking the max.

[aprudhomme]

What if hitsToLog is less than topHits? This might be better as a max operation