Implemented wildcard selector (based on #238) (#488)

* Initial check-in of wildcard to get all secrets in path (Issue#234)
* Fix wildcard for K/V v2 and Cubbyhole.  Add more tests
* Refactored out selectAndAppendResults
* Use selectAndAppendResults for wildcard
* Use normalizeOutputKey in action.js
* Refactored wildcard

---------

Co-authored-by: Scott Lemme <68233981+slemme1@users.noreply.github.com>
Co-authored-by: Lemme <slemme@massmutual.com>

src/constants.js

@@ -0,0 +1,5 @@
+const WILDCARD = '*';
+
+module.exports = {
+    WILDCARD
+};