Check attributes in the downloaded data

[b-yogesh]

When the downloaded files are preprocessed, no attributes are taken into account which could lead to missing information in the final .zarr file.
We need to investigate if there are any attributes available, keep track of them, and add them to the processed file.
We can also show the user the download_url, metadata etc.

The dimension band should be removed from the final dataset. But this can also be resolved by using the open_data method in xcube "file" data store, when opening the tiff file