major(core/graphcache): Remove graphql imports by default

[kitten]

Resolves #3096

Summary

This removes graphql from peerDependencies on all packages. @urql/core and @urql/exchange-graphcache will now depend on @0no-co/graphql.web instead and switch to graphql types dynamically where needed, and otherwise either accept @0no-co/graphql.web’s types (which will also switch to graphql; See: 0no-co/graphql.web#10) or the native graphql types.

This effectively replaces all imports we use from graphql with smaller alternatives from @0no-co/graphql.web by default as per the RFC at #3096.

Set of changes

• Replace graphql with @0no-co/graphql.web
• Add types shim for common imports to @urql/core which is marked with the /*!@ts-ignore*/ pragma in the type output
• Replace formatDocument in @urql/core with an implementation that avoids using visit
• Remove graphql from peerDependencies in all packages
• Replace graphql usage in @urql/exchange-graphcache and add shim types for schema

[kitten]

NOTE: This build change marks graphql imports in out d.ts typings files with a /*!@ts-ignore*/ pragma. While imports from graphql will change to any when the package isn’t installed, we still need to mark this in case a user has skipLibCheck: false set in their tsconfig

[kitten]

NOTE: This new type determines what we accept for query language inputs. However, TypedDocumentNode<any, any> will also work instead of DocumentNode in packages that depend on @urql/core. Alternatively, even Exclude<DocumentInput<T, V>, string> works