(build) - Fix graphql imports for Webpack 5 (#1094)
* Upgrade babel-plugin-modular-graphql
* Merge Rollup build pipelines and move babel-plugin-modular-graphql
* Add changeset
* Fix extension input on makeOutputPlugins for React bundles
* Fix broken exports on preact-urql's hooks/index.ts
* Update changeset with Webpack 5 callout