[FEATURE] Create stats api to capture hybrid query stats

[vibrantvarun]

Is your feature request related to a problem?

Create an api which maintains the stats of processors for hybrid query like normalization_processor, rrf_processor.

What solution would you like?

Introducing stats APIs to display these metrics stored in memory.

What alternatives have you considered?

Operating without access to these metrics.

Do you have any additional context?

Cluster operators could use these metrics to analyze usage patterns and gain insights into how frequently specific features are being utilized.

[martin-gaievski]

For hybridization processors we need fine granular stats: what exact technique, what are parameters for techniques.
In addition to stats for processors I would like to see some metrics for the query itself: if they use pagination, push down filter, sorting etc.