fix: make typings deno compatible (#3079)

This commit changes the types to use ESM d.ts files intead of UMD/global
files. Added an additional test to validate that the global `preact`
Typescript namespace is still present.

Co-authored-by: Jovi De Croock <decroockjovi@gmail.com>

compat/src/suspense-list.d.ts

@@ -1,11 +1,11 @@
-import { Component, ComponentChild } from '../../src';
+import { Component, ComponentChild, ComponentChildren } from '../../src';
 
 //
 // SuspenseList
 // -----------------------------------
 
 export interface SuspenseListProps {
-	children?: preact.ComponentChildren;
+	children?: ComponentChildren;
 	revealOrder?: 'forwards' | 'backwards' | 'together';
 }
 

compat/src/suspense.d.ts

@@ -1,13 +1,13 @@
-import { Component, ComponentChild } from '../../src';
+import { Component, ComponentChild, ComponentChildren } from '../../src';
 
 //
 // Suspense/lazy
 // -----------------------------------
 export function lazy<T>(loader: () => Promise<{ default: T } | T>): T;
 
 export interface SuspenseProps {
-	children?: preact.ComponentChildren;
-	fallback: preact.ComponentChildren;
+	children?: ComponentChildren;
+	fallback: ComponentChildren;
 }
 
 export class Suspense extends Component<SuspenseProps> {