Statically expose pretty printer as jasmine.pp

Pretty printing is occasionally useful outside of the places where a
configured pretty printer is injected (matchers and asymmetric equality
testers). Users sometimes use the private basicPrettyPrinter for that.
jasmine.pp is part of the public interface and uses the current runable's
custom object formatters.

spec/core/integration/EnvSpec.js

@@ -3842,6 +3842,34 @@ describe('Env integration', function() {
     });
   });
 
+  describe('pp', function() {
+    it("pretty-prints using the current runable's custom object formatters", async function() {
+      env.it('a spec', function() {
+        env.addCustomObjectFormatter(function(x) {
+          if (x === 1) {
+            return 'hi!';
+          }
+        });
+        env.expect(env.pp(1)).toEqual('hi!');
+      });
+
+      const reporter = jasmine.createSpyObj('reporter', ['specDone']);
+      env.addReporter(reporter);
+
+      await env.execute();
+
+      expect(reporter.specDone).toHaveBeenCalledWith(
+        jasmine.objectContaining({
+          failedExpectations: []
+        })
+      );
+    });
+
+    it('works when there is no current runable', function() {
+      expect(env.pp({ some: 'thing' })).toEqual("Object({ some: 'thing' })");
+    });
+  });
+
   it('forbids duplicates when forbidDuplicateNames is true', function() {
     env.configure({ forbidDuplicateNames: true });
     env.it('a spec');