Add asymmetric equality tester to match a string against a regexp

- Also move the asymmetric testers into their own dir for easier
  locating.

[#58120558] Fix #243

src/core/asymmetric_equality/Anything.js

@@ -0,0 +1,10 @@
+getJasmineRequireObj().Anything = function(j$) {
+
+  function Anything() {}
+
+  Anything.prototype.asymmetricMatch = function(other) {
+    return !j$.util.isUndefined(other) && other !== null;
+  };
+
+  return Anything;
+};