445 trends time interval

[Tmunayyer]

Changes

Issue: #445

• Set intervals for volume graphs in the trends tab
• Autocorrecting interval based on date range selection (sets hourly interval to daily if range get sets to last 90 days) due to performance on frontend

Checklist

• Code reviewed
• QA'd

[timgl]

• Clicking hourly -> today doesn't display anything
• When clicking hourly and then clicking on a data point, it shows People for the whole day, not just the hour. Same with weekly or monthly, it'll only show data for one day. I'm in favour of creating a new ticket for this to fix as this PR is getting pretty big.

[Tmunayyer]

"Today, Hourly" is fixed now. The date range was technically 0 so the time_index wasn't able to create the hourly buckets. This is fixed by some additional logic in the date_from and date_to are equal.

Will create a new issue for the people issue