chore: move the hash part in filename to query parameters (dev mode)

Development builts with HMR enabled have a bunch of problems with hashes
in filenames (e.g., https://github.com/webpack/webpack-dev-server/issues/377#issuecomment-241258405).

But to mitigate the Safari caching issue, hashes cannot be omitted.
So move them to query parameters to see if this works.

packages/@vue/cli-service/lib/config/base.js

@@ -33,7 +33,7 @@ module.exports = (api, options) => {
         .end()
       .output
         .path(api.resolve(options.outputDir))
-        .filename(isLegacyBundle ? '[name]-legacy.[hash:8].js' : '[name].[hash:8].js')
+        .filename(isLegacyBundle ? '[name]-legacy.js?[hash:8]' : '[name].js?[hash:8]')
         .publicPath(options.baseUrl)
 
     webpackConfig.resolve