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

platform/core/src/classes/metadata/StudyMetadata.js

@@ -129,6 +129,7 @@ export class StudyMetadata extends Metadata {
         );
 
         if (displaySet) {
+          displaySet.sopClassModule = true;
           displaySets.push(displaySet);
 
           return;
@@ -214,7 +215,7 @@ export class StudyMetadata extends Metadata {
    * @returns {boolean} True on success, false on failure.
    */
   addDisplaySet(displaySet) {
-    if (displaySet instanceof ImageSet) {
+    if (displaySet instanceof ImageSet || displaySet.sopClassModule) {
       this._displaySets.push(displaySet);
       return true;
     }