[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_4.test.ts

@@ -21,14 +21,14 @@ test("log a sub component with non stringifiable props", async () => {
   const log = console.log;
   console.log = arg => steps.push(arg);
 
-  class Child extends Component<any, any> {
+  class Child extends Component {
     static template = xml`<span><t t-esc="props.obj.val"/></span>`;
   }
 
   const circularObject: any = { val: 1 };
   circularObject.circularObject = circularObject;
 
-  class Parent extends Component<any, any> {
+  class Parent extends Component {
     static template = xml`<div><Child obj="obj"/></div>`;
     static components = { Child };
     obj = circularObject;