fix(types): add missing ref prop to Portal (#1031)

- Adds the missing `ref` prop to `<Portal>`.
- If `isSVG`, the element in `ref` is `SVGGElement`, otherwise it is `HTMLDivElement`.
- If `useShadow`, the element in `ref` has a non-null `shadowRoot` property.
- `ref` is unused when mounting to `document.head`, however there is no way to detect this as `HTMLHeadElement` is typed identically to `HTMLElement`.

See https://tsplay.dev/mb0P2w.

packages/solid/web/src/index.ts

@@ -48,10 +48,16 @@ export const hydrate: typeof hydrateCore = (...args) => {
  *
  * @description https://www.solidjs.com/docs/latest/api#%3Cportal%3E
  */
-export function Portal(props: {
+export function Portal<T extends boolean = false, S extends boolean = false>(props: {
   mount?: Node;
-  useShadow?: boolean;
-  isSVG?: boolean;
+  useShadow?: T;
+  isSVG?: S;
+  ref?:
+    | (S extends true ? SVGGElement : HTMLDivElement)
+    | ((
+        el: (T extends true ? { readonly shadowRoot: ShadowRoot } : {}) &
+          (S extends true ? SVGGElement : HTMLDivElement)
+      ) => void);
   children: JSX.Element;
 }) {
   const { useShadow } = props,