[pgadmin4][patch] #3244 Query elapse time granularity

[Joao De Almeida Pereira]

Hi Hackers,

Attached you can find a patch that increases the granularity of time
displayed for total run time of a query.
Also extracts the functionality, wraps it with tests.
An addon to this patch is the extraction of the function
call_render_after_poll  that uses the function that calculates the time as
well


Thanks
Joao

granularity-of-query-elapse-time.diff
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