fix: incorrect content of query with IS of VR

- Test case: SeriesNumber, InstanceNumber
- Defined type of property (SeriesNumber, InstanceNumber) to string
- The IS of VR is integer string may have "+" or "-"
- Additionally, if use integer, need to parse string to int
and process the string contains comma
> So, i decied to use string instead of int

fix: 當搜尋IS型態的數值時，返回了錯誤的內容

- Test case: SeriesNumber, InstanceNumber
- 更改了 SeriesNumber 以及 InstanceNumber 定義型態為 string
- IS 屬於 interger string，其可能包含 "+" 或 "-"
- 此外，如果使用 integer 必須將搜尋參數轉成 int 並且處理
含有逗號分隔的數值
> 所以，目前決定使用字串

models/mongodb/model/ImagingStudy.js

@@ -30,14 +30,20 @@ module.exports = function (mongodb) {
             type: String
         } , 
         dicomJson : {
-            type : Object ,
-            default : void 0
+            "00200013": {
+                vr: {
+                    type: String
+                },
+                Value: {
+                    type: [String]
+                }
+            }
         } ,
         metadata : {
             type : Object , 
             default : void 0
         }
-    });
+    }, {strict : false});
 
     const seriesSchema = new mongodb.Schema({
         uid:
@@ -80,7 +86,15 @@ module.exports = function (mongodb) {
                 Value : {
                     type : [Date] 
                 }
-            } 
+            },
+            "00200011": {
+                vr: {
+                    type: String
+                },
+                Value: {
+                    type: [String]
+                }
+            }
         }
     }, {strict : false});