STRWEB-4 add crypto-browserify depenency to polyfill crypto in axe te…

…st runs (#37)

`webpack` `v5` removed many polyfills that were present in `v4`. 
This PR restores one of them, resolving this error message:
```
message: "Module not found: Error: Can't resolve 'crypto' in '/Users/zburke/projects/folio-org/stripes-components/node_modules/axe-core'\n"
```

Refs STRWEB-4

package.json

@@ -38,6 +38,7 @@
     "commander": "^2.9.0",
     "connect-history-api-fallback": "^1.3.0",
     "core-js": "^3.6.1",
+    "crypto-browserify": "^3.12.0",
     "css-loader": "^6.4.0",
     "css-minimizer-webpack-plugin": "3.1.1",
     "csv-loader": "^3.0.3",

webpack.config.cli.dev.js

@@ -107,6 +107,7 @@ devConfig.plugins.push(
 
 // add resolutions for node utilities required for test suites.
 devConfig.resolve.fallback = {
+  "crypto": require.resolve('crypto-browserify'),
   "stream": require.resolve('stream-browserify'),
   "util": require.resolve('util-ex'),
 };