FilteredItemsSelectionDialog was a handy tool for implementing dialogs that will allow user to select elements from a large set, as it offered a nice filtering feature. But it relies on the PlatformUI and IWorkbench which are not present in E4. Is there any E4 equivalent of this dialog available out there?
No, there is nothing provided. For e4 you can only use the SWT and JFace dialogs, anything else you will have to write yourself.