[IDC-1670] Better display of derived datasets in side panel. (#1962)

* WIP

* WIP

* WIP

* WIP

* Working click on seg.

* Load SEG if not loaded and set active.

* RTSTRUCT

* feat: 🎸 Display SEG and RTSTRUCT in side panel

* Throw error if dataset not available.

* Add delay in microscopy viewer e2e test.

* Add delay in microscopy viewer e2e test.

extensions/dicom-segmentation/src/utils/refreshViewports.js

@@ -0,0 +1,5 @@
+export default function refreshViewports() {
+  cornerstone.getEnabledElements().forEach(enabledElement => {
+    cornerstone.updateImage(enabledElement.element);
+  });
+}