[Concurrent Segment Search] Add support for profile option with concurrent aggregation

[sohami]

Placeholder issue to support collecting profile stats with concurrent aggregation flow (both for global and non-global aggregation). This will be dependent on #7353.

Expected behavior
Profile stats with different relevant information similar to sequential flow should be available. For example: with concurrent model, we can have some stats like max/avg/min latency and the slice counts.