Optionally use a temporal end field for datetime ranges

[kdesjard]

• Add an optional temporal_end_field to the config
• For a Pg datasource, if the temporal end column is defined, use that for the end of the range in a datetime query parameter

https://beta.schemas.opengis.net/ogcapi/common/part2/0.1/collections/openapi/parameters/datetime.yaml

"If a feature has multiple temporal properties, it is the decision of the server whether only a single temporal property is used to determine the extent or all relevant temporal properties."