add @graphiql/plugin-explorer package (#2715)

* add explorer plugin package

* add `graphql` and `@graphiql/react` as properties in CDN bundle

Author: thomasheyenbrock

.changeset/mean-dancers-visit.md

@@ -0,0 +1,5 @@
+---
+'@graphiql/plugin-explorer': minor
+---
+
+Add a package that exports a plugin to use the GraphiQL Explorer from OneGraph

.changeset/thirty-eyes-behave.md

@@ -0,0 +1,5 @@
+---
+'graphiql': patch
+---
+
+Add the contents of `graphql` and `@graphiql/react` as static properties to the `GraphiQL` component in CDN bundles so that these modules can be reused from plugin CDN bundles.

examples/graphiql-explorer/index.html

@@ -6,7 +6,6 @@
   "workspaces": {
     "packages": [
       "packages/*",
-      "examples/graphiql-explorer",
       "examples/graphiql-webpack",
       "examples/monaco-graphql-webpack",
       "examples/monaco-graphql-react-vite"
@@ -33,14 +32,15 @@
     "npm": "please_use_yarn_instead"
   },
   "scripts": {
-    "build": "yarn build:clean && yarn build:packages && yarn build:graphiql-react && yarn build:graphiql",
+    "build": "yarn build:clean && yarn build:packages && yarn build:graphiql-react && yarn build:graphiql-plugin-explorer && yarn build:graphiql",
     "build-bundles": "yarn prebuild-bundles && wsrun -p -m -s build-bundles",
     "build-bundles-clean": "rimraf '{packages,examples,plugins}/**/{bundle,cdn,webpack}' && yarn workspace graphiql run build-bundles-clean",
     "build-clean": "wsrun -m build-clean ",
     "build-demo": "wsrun -m -s build-demo",
     "build-docs": "rimraf 'packages/graphiql/typedoc' && typedoc 'packages'",
     "build:clean": "yarn tsc --clean && yarn tsc --clean resources/tsconfig.graphiql.json",
     "build:graphiql": "yarn tsc resources/tsconfig.graphiql.json",
+    "build:graphiql-plugin-explorer": "yarn workspace @graphiql/plugin-explorer run build",
     "build:graphiql-react": "yarn workspace @graphiql/react run build",
     "build:packages": "yarn tsc",
     "build:watch": "yarn tsc --watch",