Override time grain in annotations

[betodealmeida]

Allow overriding the time grain of time series annotations.

The good news is that we've unified the granularity of Druid and SQLAlchemy, using ISO duration strings, so we can apply the time grain of a Druid time series to a SQLAlchemy time series annotation, and vice versa.

The bad news is that this is currently a bit ugly because we don't know if the time series annotation has a SQLAlchemy or a Druid datasource. So we pass the current time grain in both granularity and time_grain_sqla. This only works if the SQLAlchemy datasource has a main temporal table configured.

In the future we should unify this as a single parameter, IMHO.

The screenshot below shows an annotation that was saved with hourly grain (sqla_hourly) being loaded with daily grain. Note the new checkbox, "Override time grain":

[codecov-io]

Codecov Report

Merging #5084 into master will not change coverage.
The diff coverage is n/a.

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##           master    #5084   +/-   ##
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  Coverage   77.53%   77.53%           
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  Files          44       44           
  Lines        8710     8710           
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  Hits         6753     6753           
  Misses       1957     1957

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