feat!: msw/graphql, graphql as an optional peer dependency

[kettanaito]

• Related to Improvements (for Vitest) #2687
• Fixes Vitest tests fail with error "Cannot find package 'graphql' imported" in v2.4.0 #2248
• Fixes List "graphql" as a peer dependency #2185

Motivation

msw leaks the graphql namespace through the root entrypoints, which makes graphql import problematic for developers who aren't even using GraphQL. This negatively impacts the bundle footprint as well.

This is a change in a set of changes aimed to improve DX and bundle size of msw across the board.

⚠️ BREAKING CHANGES

• graphql namespace and any related values/types are no longer exported from msw. Please use a designated msw/graphql export path to work with GraphQL requests.
• msw/core/graphql export path has been changed to msw/graphql for brevity.

Todos

• Set the target branch to feat/3.0. This is not meant to be released separately.
• Rebase on top of feat: use the network source architecture (defineNetwork) #2650 to benefit from setupWorker/setupServer accepting AnyHandler and not RequestHandler, which is incompatible with GraphQLHandler

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[kettanaito]

@Andarist, hi 👋 Mentioning you just in case so this wouldn't conflict with the work you're doing. TL;DR msw/graphql is an explicit entrypoint now, graphql is a proper optional peer dependency. Added a new build config to tsup.config.ts. Dropped the graphqlImport plugin since there's no need to guard against those imports in the core—nothing depends on grahpql there anymore.