feat: implement subscription changes GET request

bruno/Subscriptions API/Get subscriptions changes for device.bru

@@ -0,0 +1,20 @@
+meta {
+  name: Get subscriptions changes for device
+  type: http
+  seq: 5
+}
+
+get {
+  url: http://localhost:8080/api/2/subscriptions/:username/:device_id?since=1740430923
+  body: none
+  auth: inherit
+}
+
+params:query {
+  since: 1740430923
+}
+
+params:path {
+  username: test
+  device_id: test.json
+}

bruno/Subscriptions API/Upload subscription changes for device.bru

@@ -4,13 +4,20 @@ meta {
   seq: 4
 }
 
-get {
+post {
   url: http://localhost:8080/api/2/subscriptions/:username/:device_id
-  body: none
-  auth: none
+  body: json
+  auth: inherit
 }
 
 params:path {
-  username: 
-  device_id: 
+  username: test
+  device_id: test.json
+}
+
+body:json {
+  {
+    "add": ["test_add_1"],
+    "remove": ["test_remove_1", "test_add_2"]
+  }
 }