fix: 🐛 Add DicomLoaderService & FileLoaderService to fix SR, PDF, and SEG support in local file and WADO-RS-only use cases (#862)

* fix: 🐛 Local file: failing when retrieving segmentation data

Fix segmentation data retrieval issues for local file. Changed from
fecthing to use cornerstone loadAndCache method

BREAKING CHANGE: DICOM Seg

Closes: part of #838

* Switch SEG retrieval to WADO-RS

* Forgot a debugger

* refactor: 💡 Code refactor. Minor changes into methods

* fix: 🐛 Load local files: PDF

Items:
1. FileLoaderService: used for serveral operations on local files(load it,  get list of studies, group them, accepting dicom and pdf)
2. DicomLoaderService: used for loading dicom based on dataset and studies. Depending on type of dicom loader might change. WIP
3. Refactor PDF and handleSegmentationStorage to use DicomLoaderService

* fix: 🐛 Code review

* fix: 🐛 Code review. Changed:Folder organization and dicom file

Move fileLoaderService and others to a specific folder. When loading
dicom file change to only retrieve the file(not use cornerstone to cache
or anything else).

* fix: 🐛 Code review. Move dicomLoaderService to core

Moved dicomLoaderService to ohif/core and localFileLoaders to a specific
folder.

* fix: 🐛 Code review

Simplified method to get study for dicom file. Added error handling on
file loading. DicomLoaderService to be exposed on ohif/core/utils
instead.

* fix: 🐛 Reduce local load to one method only

Reduced local file load to one method only

* fix: 🐛 HTML to use dicomLoaderService. Prefer wadors than (uri)

* fix: 🐛 Code implementation for multiframe files

* fix: 🐛 Code review. Default local loader to dicom

Closes: 838

* fix: 🐛 Code review. Use relative path to require DICOMWeb

Closes: 838

* fix: 🐛 Code review. Fix unit test. Added DicomLoaderService mod

Closes: 838

* fix: 🐛 Code review. Add 'Seg' on left thumb

When getting/creating dataset get modality for file/image read

Closes: 838

extensions/cornerstone/src/handleSegmentationStorage.js

@@ -4,7 +4,7 @@ import OHIF from '@ohif/core';
 import cornerstone from 'cornerstone-core';
 import cornerstoneTools from 'cornerstone-tools';
 
-const { StackManager } = OHIF.utils;
+const { StackManager, DicomLoaderService } = OHIF.utils;
 
 function getDisplaySet(studies, studyInstanceUid, displaySetInstanceUid) {
   const study = studies.find(
@@ -52,14 +52,6 @@ function addSegMetadataToCornerstoneToolState(
   }
 }
 
-function retrieveDicomData(wadoUri) {
-  // TODO: Authorization header depends on the server. If we ever have multiple servers
-  // we will need to figure out how / when to pass this information in.
-  return fetch(wadoUri, {
-    headers: OHIF.DICOMWeb.getAuthorizationHeader(),
-  }).then(response => response.arrayBuffer());
-}
-
 async function handleSegmentationStorage(
   studies,
   studyInstanceUid,
@@ -73,8 +65,11 @@ async function handleSegmentationStorage(
     studyInstanceUid,
     displaySetInstanceUid
   );
-  const segWadoUri = displaySet.images[0].getData().wadouri;
-  const arrayBuffer = await retrieveDicomData(segWadoUri);
+
+  const arrayBuffer = await DicomLoaderService.findDicomDataPromise(
+    displaySet,
+    studies
+  );
   const dicomData = dcmjs.data.DicomMessage.readFile(arrayBuffer);
   const dataset = dcmjs.data.DicomMetaDictionary.naturalizeDataset(
     dicomData.dict