Add inline-requires-plugin implementation hash to cache key

Summary:
While testing changes to `inline-requires-plugin` I noticed changes to the implementation were not changing the transform cache key as they should.

It looks like we just missed adding `inline-requires-plugin`  to `getTransformPluginCacheKeyFiles()` when we vendored it last year: D47439822.

Changelog:
```
 - **[Fix]**: Invalidate transform cache on changes to inline-requires implementation.
```

Reviewed By: huntie

Differential Revision: D62689635

fbshipit-source-id: 590702489e8b631cf032128e59d6cde927111f6f

packages/metro-transform-plugins/src/index.js

@@ -61,6 +61,7 @@ module.exports = ({
     require.resolve('./constant-folding-plugin'),
     require.resolve('./import-export-plugin'),
     require.resolve('./inline-plugin'),
+    require.resolve('./inline-requires-plugin'),
     require.resolve('./normalizePseudoGlobals'),
   ],
 }: TransformPlugins);