refactor(benchmarks): align tree benchmark with largetable benchmark

- add ng2_switch benchmark to track `ngFor` over `ngSwitch`
- measure create only, createDestroy and update
- simplify the created dom
- always add a style binding

modules/benchmarks/src/tree/incremental_dom/index.html

@@ -10,7 +10,7 @@
     <button>Apply</button>
   </form>
 
-  <h2>Baseline tree benchmark</h2>
+  <h2>Incremental-Dom Tree Benchmark</h2>
   <p>
     <button id="destroyDom">destroyDom</button>
     <button id="createDom">createDom</button>