Time-series config time zone enhancements

Context

This is a ticket for summarizing the time-zone related solutions proposed in https://github.com/CartoDB/cartodb/issues/11970 and in https://github.com/CartoDB/cartodb/issues/11985 for the config view in Time Series widgets.

In short, the changes consist in integrating in the UI a new column type selector between Time stamp and Numeric.

The first one (Time stamp) will enable a

1. Time-zone drop-down menu that is defaulted in the local time-zone in the column and a
2. Time-granularity drop-down menu with aggregations per Minutes, Hours, Days, Months and Years and an Auto value that automatically selects the aggregation value .

The second one (Numeric) will enable the Buckets slider, that will be otherwise disabled if Time stamp is selected.

According to https://github.com/CartoDB/cartodb/issues/11970 in order to do this we will internally start processing the timeseries column in UTC and the aggregate it depending on the options selected in the new dropdowns.

cc @CartoDB/design for getting this design ready

[urbanphes]

Updated

Here’s the InVision project: https://invis.io/A9BKH4DED

[saleiva]

About the time-zone customization in the “public view”, why don’t we simplify the number of options and let viewers to select between the timezone choosen by the creator, or the timezone present in the viewer browser.

I don’t see any use case were I’d like to select a different timezone to the one defined by the builder or my browser.