[enzyme] state() with no props as an "S" (state type) return type (#12211)

* clarify and fix 'options' object types; Hammer.Manager requires an EventTarget, not HTMLElement

* fix RecognizerTuple type

* `state()` with no props has an `S` (state type) return value

enzyme/enzyme-tests.tsx

@@ -204,7 +204,7 @@ namespace ShallowWrapperTest {
     }
 
     function test_state() {
-        shallowWrapper.state();
+        const state: MyComponentState = shallowWrapper.state();
         shallowWrapper.state('key');
         const tmp: String = shallowWrapper.state<String>('key');
     }

enzyme/enzyme.d.ts

@@ -204,8 +204,9 @@ declare module "enzyme" {
          * Returns the state hash for the root node of the wrapper. Optionally pass in a prop name and it will return just that value.
          * @param [key]
          */
-        state(key?: string): any;
-        state<T>(key?: string): T;
+        state(): S;
+        state(key: string): any;
+        state<T>(key: string): T;
 
         /**
          * Returns the context hash for the root node of the wrapper. Optionally pass in a prop name and it will return just that value.