Move internal modules to “internal” folder.

.internal/getAllKeysIn.js

@@ -0,0 +1,17 @@
+import baseGetAllKeys from './.internal/baseGetAllKeys.js';
+import getSymbolsIn from './.internal/getSymbolsIn.js';
+import keysIn from './keysIn.js';
+
+/**
+ * Creates an array of own and inherited 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 getAllKeysIn(object) {
+  return baseGetAllKeys(object, keysIn, getSymbolsIn);
+}
+
+export default getAllKeysIn;