Support isinstance() checks in the base types

[vmarkovtsev]

To avoid the error on e.g. isinstance(QueryType(), SchemaBindable)

TypeError: Instance and class checks can only be used with @runtime_checkable protocols

[rafalp]

@vmarkovtsev we also need to to move extension classes to protocol.

[vmarkovtsev]

@rafalp why do we need to move classes in the same PR? Or I don't get what you request...

[rafalp]

@vmarkovtsev can you rebase against master so tests pipeline is run? You will see an error then that @runtime_checkable can only be used on classes that extend Protocol which is not the case for Extensions.

[vmarkovtsev]

I've rebased, however, there are two things:

1. Extension does inherit from Protocol. In fact, I have this PR already working in our production, so I wonder how come something's broken.
   
2. CI does not trigger for first-time contributors like me and has to be approved manually, I think.

[rafalp]

Okay, so GH is not letting me run CI for this PR because for some reason there's no "Approve and Run" option 🤦‍♂️

[rafalp]

Okay, looking good. Thank you!

[rafalp]

@vmarkovtsev and it failed: https://github.com/mirumee/ariadne/runs/5989948597?check_suite_focus=true

[vmarkovtsev]

LOL. I'll try to PR a fix ASAP!

[rafalp]

@vmarkovtsev I've removed decorator from one extension class for now and I am researching why GitHub is not running actions for forks. Looks like PR authors need to enable actions on their fork first?

[rafalp]

I'll release current master as 0.15.0dev5 so you can ride the edge if you want to.

[vmarkovtsev]

So

@runtime_checkable
class Extension(Protocol)

works but

@runtime_checkable
class ExtensionSync(Extension):

doesn't 🤔 Maybe it's not needed because the parent class is already runtime_checkable and the reported error is misleading 🤔

[vmarkovtsev]

Thanks @rafalp!

[rafalp]

0.15.0.dev5 is out.