[WIP] Migrate React Context to Zustand

[acao]

so excited for this long awaited PR, thank you @dimaMachina for providing the impetus and this big rework to build off of!

Summary

• converts @graphiql/react react contexts to use zustand with immer
• moves most of this logic to @graphiql/toolkit where the new store is located
• most contexts in @graphiql/react will be deleted, except for maybe plugin context and theme context

Checklist

• [x] editor context & hooks
• [x] schema context & hooks
• [x] execution context & hooks
• [x] graphiql working (base case)
• [ ] refactor zustand & @graphiql/react
• [ ] explorer context & hooks
• [ ] history context & hooks
• [ ] fix/migrate existing test coverage
• [ ] add new test coverage where useful
• [ ] graphiql working (fully)
• [ ] e2e passing

[changeset-bot[bot]]

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Latest commit: b213ceb4857c461c0c99fa65d22ea9e72d75a886

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[Joanna2473]

.

[dimaMachina]

replaced by https://github.com/graphql/graphiql/pull/3946, tracking progress in https://github.com/graphql/graphiql/issues/3874