GraphQL 15 support

[tony]

Fixes #60

• graphql-tools -> @graphql-tools/schema from 2.7.3 -> 8

  Fixes deprecation warning

  • 7.0 release notes
  • 8.0 release notes
• Allow graphql as peer dependnecy
• Update snapshots

[tony]

As an update, we're using a variation of this in production with relay 11 and it's working great (so far!). You can test it at @peergrade/graphql-schema-typescript

[tony]

@dangcuuson Proposal: it may make sense to make a GraphQL 15 release on NPM, then merge #67 for GraphQL 16.

In either case it's also okay to close this PR if that doesn't work out. Also you can share NPM/repo access if you'd like to add maintainers to publish if you're busy

Thank you!!

[tx0c]

After a full year of no maintenance after Apr 2021, is it fair to declare cyber death of this project?

https://github.com/dangcuuson/graphql-schema-typescript/graphs/contributors

[jlowcs]

I forked the package and published these changes as @jlowcs/graphql-schema-typescript@1.6.0

[tony]

Closed via #67 in a17d062