Sub-day time resolution support

[SpacemanPaul]

Currently the finest supported time resolution is day (solar day or "raw" UTC day).

We have had some interest expressed in datacube-ows supporting sub-day time resolutions (e.g. per hour, per minute), to support weather observations, etc.

[U-Tyagi]

It is needed for weather observations acquired every half an hour by geostationary satellites. This issue is crucial for such data acquisitions with only available values of time_resolution parameter. At least Daily Average should be automatically computable through datacube_ows CONFIG.

[SpacemanPaul]

Unfortunately I think getting daily average working would be just as much work as doing it properly.

You could potentially do something useful with the fuse_func setting, depending on the format of the data, but I think an average would be challenging to implement from that angle.