Include time spent in queues in profiler

[Poojita-Raj]

Is your feature request related to a problem? Please describe.
In the profiler output, currently the time spent in queue in the active search thread pool of the query is not being measured. This could be a helpful addition to the profiler response for a more in-depth look at what parts of the search query are taking up time.

Describe the solution you'd like
Modify the profile response to include a time_spent_in_queues field that provides the user with additional information regarding how long the request was queued in the search pool.

Describe alternatives you've considered
N/A

Additional context
#705