[IMP] types: make component generic types optional

In most cases, we just want Component<any, Env>. But since it was so
annoying to have always the type Env, we actually used
Component<any,any> everywhere.

With this commit, the generic types have a default (and their order is
swapped), so we can simply use Component in most cases, and
Component<Props> when we want to type the props.

tests/tooling/debug_script_1.test.ts

@@ -22,11 +22,11 @@ test("can log full lifecycle", async () => {
   const log = console.log;
   console.log = arg => steps.push(arg);
 
-  class Child extends Component<any, any> {
+  class Child extends Component {
     static template = xml`<div>child</div>`;
   }
 
-  class Parent extends Component<any, any> {
+  class Parent extends Component {
     static template = xml`<div><Child t-if="state.flag"/></div>`;
     static components = { Child };
     state = useState({ flag: false });