[flask]: /covidcast/trend endpoint #483
Merged
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based on #481
adds a new custom endpoint
/covidcast/trend
which computes the trend for a given date and window.e.g.
http://localhost:5000/covidcast/trend?signal=fb-survey:smoothed_cli&geo=state:ny&date=20210401&window=20200101-20210402
will result in:

note: I just have limited local test data, so results may vary in your system