Create new webpack chunk for graphql

When we reduced our main.js bundle size, it seems like apollo and
graphql and related dependencies got included multiple times into
different chunks. By manually defining a "graphql" chunk we can increase
cacheability.

config/webpack.config.js

@@ -278,6 +278,14 @@ module.exports = {
           chunks: 'initial',
           minChunks: autoEntriesCount * 0.9,
         }),
+        graphql: {
+          priority: 16,
+          name: 'graphql',
+          chunks: 'all',
+          test: /[\\/]node_modules[\\/][^\\/]*(immer|apollo|graphql|zen-observable)[^\\/]*[\\/]/,
+          minChunks: 2,
+          reuseExistingChunk: true,
+        },
         monaco: {
           priority: 15,
           name: 'monaco',