Add remote data loading and display for public https datasets and supported data formats

[RandomFractals]

Use Open Data File prompt added in #48 for testing it

[RandomFractals]

Example loading remote data file via our custom Tabular Data: Open Data File command prompt added in #48:

[RandomFractals]

Covid-19 aggregate country data loaded from this public dataset: https://pkgstore.datahub.io/core/covid-19/countries-aggregated_csv/data/0c89569a53f7f104c4b2197575713a8d/countries-aggregated_csv.csv