Export ComponentAccessor and SignalComponentAccessor types.

We only export types because consumers should not be able to call `ComponentAccessor.fromComponent` on an arbitrary component as this would leak internal details about that component such as its closed shadow root. Consumers should only use these objects via the provided `host` parameter in `defineComponent`.

src/index.ts

@@ -7,3 +7,9 @@ export { ElementAccessor } from './element-accessor.js';
 export { type Queryable } from './queryable.js';
 export { QueryRoot } from './query-root.js';
 export { hydrate, isHydrated } from './hydration.js';
+
+// Only export the `ComponentAccessor` object types because consumers should not
+// construct these objects directly as doing so would leak internal details
+// about components such as a closed shadow root.
+export { type ComponentAccessor } from './component-accessor.js';
+export { type SignalComponentAccessor } from './signal-component-accessor.js';