Allow for the request policy to be changed when triggering manual queries

[kitten]

https://spectrum.chat/urql/general/would-it-be-possible-to-add-a-cache-interaction-panel-to-the-dev-tools~69e57921-a5ab-411e-a52b-758735fb99bc

This would allow people to more easily query data directly when debugging what data the cache contains in edge case scenarios where random pieces of queries don't correspond with the UI 1:1, by flipping the policy to cache-only

[andyrichardson]

Thanks for the suggestion @kitten <3

I think this would be a nice addition