feat(proxy datasource): JSON server configuration launch (#2791)

* feat: delegating dicom web proxy datasource

* fix: configurably allow WADO image loader to issue preflight OPTIONS request

* Added documentation and fixed up some error handling from PR review

* review comments changes

* another small code review fix

extensions/default/src/getDataSourcesModule.js

@@ -5,6 +5,7 @@
 import { createDicomWebApi } from './DicomWebDataSource/index.js';
 import { createDicomJSONApi } from './DicomJSONDataSource/index.js';
 import { createDicomLocalApi } from './DicomLocalDataSource/index.js';
+import { createDicomWebProxyApi } from './DicomWebProxyDataSource/index.js';
 
 /**
  *
@@ -16,6 +17,11 @@ function getDataSourcesModule() {
       type: 'webApi',
       createDataSource: createDicomWebApi,
     },
+    {
+      name: 'dicomwebproxy',
+      type: 'webApi',
+      createDataSource: createDicomWebProxyApi,
+    },
     {
       name: 'dicomjson',
       type: 'jsonApi',