feat: add query parameter for allowing datasets

[SimonThordal]

Closes #427

[jbothma]

Nice!

[pudo]

Nitpick: we have exclude_dataset and now we're adding allow_datasets (plural). What if we tried to make these matching, e.g. include_dataset for the new one?

[SimonThordal]

Nitpick: we have exclude_dataset and now we're adding allow_datasets (plural). What if we tried to make these matching, e.g. include_dataset for the new one?

That was my first choice actually, but I changed it since the path parameter already is called dataset and I thought it made it clearer that we were further refining that first dataset / collection. I'm good with either though. As for plural it's for making it clear that it's a list and not a single string.

[pudo]

Both of them are lists - only the dataset is part of the path, right?

[SimonThordal]

Both of them are lists - only the dataset is part of the path, right?
True, that was part of my confusion at first. From the signature of /match it sounded as though I should specify a single dataset as the path parameter dataset and then I could pass a single dataset as exclude_dataset.

It becomes clear once you read through the code of course, but I think something like {collection}/match?exclude_datasets=[]&include_datasets=[] would have been easier to understand at first glance.
I'll switch back to include_dataset for now though and then we can always see whether we want to change this later :)

[SimonThordal]

Just saw that we want to add this to /search as well, so I'll include that here.