Allow GHSearchPRs to take prameters

[gozes]

It would be helpful if GHSearchPRs could take a query filter as a parameter instead of having an input.
see the example below so I can map it to key

GHSearchPRs is:open

currently, I have to map GHSearchPRs to a key and then type is:open every time. if GHSearchPRs took a parameter I would be able to map an arbitrary complex filter to a key for searching.

for example

GHSearchPRs is:open is:pr -author:app/renovate