* **ImageOverlayViewerTool:** add ImageOverlayViewer tool that can render image overlay (pixel overlay) of the DICOM images ([#3163](https://github.com/OHIF/Viewers/issues/3163)) ([69115da](https://github.com/OHIF/Viewers/commit/69115da06d2d437b57e66608b435bb0bc919a90f))
* **grid:** remove viewportIndex and only rely on viewportId ([#3591](https://github.com/OHIF/Viewers/issues/3591)) ([4c6ff87](https://github.com/OHIF/Viewers/commit/4c6ff873e887cc30ffc09223f5cb99e5f94c9cdd))
* **data source UI config:** Popup the configuration dialogue whenever a data source is not fully configured ([#3620](https://github.com/OHIF/Viewers/issues/3620)) ([adedc8c](https://github.com/OHIF/Viewers/commit/adedc8c382e18a2e86a569e3d023cc55a157363f))
* **cloud data source config:** GUI and API for configuring a cloud data source with Google cloud healthcare implementation ([#3589](https://github.com/OHIF/Viewers/issues/3589)) ([a336992](https://github.com/OHIF/Viewers/commit/a336992971c07552c9dbb6e1de43169d37762ef1))
* **memory leak:** array buffer was sticking around in volume viewports ([#3611](https://github.com/OHIF/Viewers/issues/3611)) ([65b49ae](https://github.com/OHIF/Viewers/commit/65b49aeb1b5f38224e4892bdf32453500ee351f8))