[ADF-850] example on using in-memory form data (#2037)

* stub for custom form service

* demo polishing

- use in-memory formService only for the corresponding demo page 'Form'
- support for mocking rest field values
- demo of the typeahead data mocked

* load data from app config

* fix lint errors

* separate Form and Form List demos

demo-shell-ng2/app/components/form/form-demo.component.css

@@ -1,8 +1,3 @@
 .form-container {
     padding: 10px;
 }
-
-.store-form-container{
-    width: 80%;
-    height: 80%;
-}