fix(runtime): add height, width Source attrs (#4943)

add the height and width properties for the `SourceHTMLAttributes`.
prior to this commit, users attempting to properly type a `<source/>`
element in JSX would run into TypeScript errors:
```tsx
render() {
  return <picture><source height={100} width={100}/></picture>;
}
```
```
[ ERROR ]  TypeScript: src/components/my-component/my-component.tsx:31:29
           Type '{ height: number; width: number; }' is not assignable to type
           'SourceHTMLAttributes<HTMLSourceElement>'.Property 'height' does not exist on type
           'SourceHTMLAttributes<HTMLSourceElement>'.

     L30:  render() {
     L31:    return <picture><source height={100} width={100}/></picture>;
     L32:  }

[26:05.7]  build failed in 1.12 s
```

adding these typings as optional numbers resolves these types of
compile-time errors

fixes: #4942

STENCIL-977

Author: rwaskiewicz

src/declarations/stencil-public-runtime.ts

@@ -1259,11 +1259,13 @@ export namespace JSXBase {
   }
 
   export interface SourceHTMLAttributes<T> extends HTMLAttributes<T> {
+    height?: number;
     media?: string;
     sizes?: string;
     src?: string;
     srcSet?: string;
     type?: string;
+    width?: number;
   }
 
   export interface StyleHTMLAttributes<T> extends HTMLAttributes<T> {