Allow for temporal resampling in cube generator #523
Description
Is your feature request related to a problem? Please describe.
A cube generator xcube gen2 request allows specifying time_period but it is not yet recognized for temporal resampling.
However, spatial resampling is performed using time_period if a given input data store supports it. For example, this is the case for the sentinelhub data store that utilizes the Sentinel Hub API.
Describe the solution you'd like
If an input data store does not support the time_period parameter, the cube generator should perform temporal resampling using xarray.
This issue should be addressed together with #491.