Provide a standard way to provide queries in actions

[kjellmorten]

Params are currently the only way to pass queries to adapters, and it is up to the source def whether or not these will be regarded. They are typically mapped to an uri or to query props. It is possible to pass a query object as a param, but that will be adapter specific.

Instead, it should be possible to specify a query on an action, that the adapters will have to support, but without depending on correctly mapping in endpoint defs.