Add configurable timeout for pullSchema

[SeppahBaws]

Describe the feature

Currently, pullSchema uses fetch without much more, resulting in a 4-minute timeout (in my case) if the remote api is unreachable. This lead to a lot of confusion as to why my dev server wasn't starting, and it would've been neat to have it say "can't connect to your remote API" sooner.

We could do something like this: https://stackoverflow.com/questions/46946380/fetch-api-request-timeout/57888548#57888548

Criticality

cool improvement, my projects will benefit from it