test(bruno): Add API tests for Kobo, Koreader, OPDS, collections

- Add Kobo bookmark/markup sync tests
- Add Koreader progress/bookmark sync tests
- Add OPDS feed tests
- Add collection tests
- Add sync tests for book linking

bruno/sidecar/Download Device Sidecar File.bru

@@ -0,0 +1,19 @@
+meta {
+  name: "Download Device Sidecar File"
+  type: http
+  seq: 2
+}
+
+get {
+  url: {{base_url}}/api/devices/{{device_id}}/sidecar/download
+  auth: {
+    type: bearer
+    bearer: {{user_token}}
+  }
+}
+
+assert {
+  response.status == 200
+  response.headers["Content-Type"] contains "application/json"
+  response.headers["Content-Disposition"] contains ".bookmann.json"
+}