Fix some hash lookup behaviors

[rmosolgo]

Fixes #4059
Fixes #4068

[alexcwatt]

@rmosolgo I found this PR from the changelog which mentions this PR as where

Support hash_key: lookups on Hash-like objects #4072

This is an awesome improvement!

I have a project still on 1.x and was wondering if you would consider backporting hash_key lookups on non-Hash objects there? Specifically I have an ActiveRecord object where I'd like to be able to use hash_key.

I think the relevant code in 1.x is here (hash_key only works for Hash objects):
https://github.com/rmosolgo/graphql-ruby/blob/v1.13.17/lib/graphql/schema/field.rb#L838-L846

vs in 2.x where non-Hash objects are also supported:
https://github.com/rmosolgo/graphql-ruby/blob/v2.0.16/lib/graphql/schema/field.rb#L669-L675

I'm not sure that all the enhancements for hash_key are in this PR, but I think the linked bits of code above are relevant.

[rmosolgo]

👋 Hey @alexcwatt, I'd be happy to try to backport the behaviors you're looking for. I got started over in #4286, will that cover it for you? Please let me know more details on the PR if there's something else you have in mind!