Add babel-plugin-modular-graphql to rewrite graphql imports

[kitten]

Adds babel-plugin-modular-graphql to rewrite graphql imports to their modular variants.

[changeset-bot]

🦋 Changeset is good to go

Latest commit: c3fa0d7

We got this.

This PR includes changesets to release 3 packages

Name	Type
@urql/exchange-graphcache	Patch
@urql/exchange-populate	Patch
@urql/core	Patch

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[kitten]

Some quick bundlesize smoke tests:

• threed-web full build: 103.97kB down to 97.02kB minzipped (-6.78 KB)
• CodeSandbox sample full build: 60.84 KB minzipped unchanged.

So it seems that this indeed benefits some parts of our build, namely graphcache, but not all.

Edit: I'm currently evaluating which parts of the graphql package we should be including, ignoring Graphcache, and found the following:

• print from graphql/language/printer (1.46kB minzipped)
  • blockString from graphql/language/blockString (542B minzipped)
• visit from graphql/language/visitor (1.5kB minzipped, print depends on this)
• Kind from graphql/language/kinds (599B minzipped)
• GraphQLError from graphql/error/GraphQLError (1.76kB minzipped)
  • graphql/jsutils/isObjectLike (239B minzipped)
  • graphql/language/location (212B minzipped)
  • graphql/language/printLocation (583B minzipped)
• parse from graphql/language/parser (3.37kB minzipped)
  • inspect from graphql/jsutils/inspect (794B minzipped)
  • graphql/jsutils/inspect (749B minzipped)
  • graphql/jsutils/devAssert (145B minzipped)
  • graphql/error/syntaxError (181B minzipped)
  • graphql/language/source (322B minzipped)
    • graphql/polyfills/symbols (234B minzipped)
  • graphql/language/tokenKind (303B minzipped)
  • graphql/language/lexer (2.21kB minzipped)
  • graphql/language/ast (374B minzipped)
    • graphql/jsutils/defineToJSON (255B minzipped)

If I haven't forgotten any this adds up to around: 15.72kB (not-minzipped but should be an upper boundary). I might've forgotten something, but the estimate from webpack-bundle-analyzer actually comes down to 9.08kB for the included graphql modules, which seems realistic and good.