Refactor `createHandler` to `createHandlerFromSchema`

[alessbell]

This PR does a few things:

• introduces utilities that generates a base set of default resolvers when calling createHandler with a schema document
• renames the previous version of createHandler to createHandlerFromSchema
• introduces a custom request handler class for future customization (see https://github.com/apollographql/graphql-testing-library/issues/44)
• pulls the public GH schema into the repo for testing purposes (see PR diff size 😅)
• accepts a generic type argument for Resolvers which now type checks any resolvers passed into createHandler or createHandlerFromSchema

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🦋 Changeset detected

Latest commit: 674da609ebbff23a573455e927427f30d55f83ab

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------------------- | ----- | | @apollo/graphql-testing-library | Minor |

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A new release has been made for this PR. You can install it with:

npm i @apollo/graphql-testing-library@0.0.0-pr-83-20240801212913

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A new release has been made for this PR. You can install it with:

npm i @apollo/graphql-testing-library@0.0.0-pr-83-20240805191102

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[github-actions[bot]]

A new release has been made for this PR. You can install it with:

npm i @apollo/graphql-testing-library@0.0.0-pr-83-20240813204214