Move internal modules to “internal” folder.

.internal/getAllKeys.js

@@ -0,0 +1,16 @@
+import baseGetAllKeys from './.internal/baseGetAllKeys.js';
+import getSymbols from './.internal/getSymbols.js';
+import keys from './keys.js';
+
+/**
+ * Creates an array of own enumerable property names and symbols of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names and symbols.
+ */
+function getAllKeys(object) {
+  return baseGetAllKeys(object, keys, getSymbols);
+}
+
+export default getAllKeys;