feat(clients): add Readarr support (#490)

* Add initial Readarr support

* Readarr working with MaM

* feat(clients): readarr add tests

pkg/readarr/testdata/release_push_ok_response.json

@@ -0,0 +1,37 @@
+{
+  "guid": "PUSH-https://www.mock-indexer.test/tor/download.php?tid=000000",
+  "quality": {
+    "quality": {
+      "id": 3,
+      "name": "EPUB"
+    },
+    "revision": {
+      "version": 1,
+      "real": 0,
+      "isRepack": false
+    }
+  },
+  "qualityWeight": 301,
+  "age": 0,
+  "ageHours": 0.00138141025,
+  "ageMinutes": 0.08288463833333333,
+  "size": 1048576,
+  "indexerId": 0,
+  "indexer": "mock-indexer",
+  "releaseHash": "",
+  "title": "The Best Book by Famous Author [English / epub, mobi]",
+  "discography": false,
+  "sceneSource": false,
+  "authorName": "Famous Author",
+  "bookTitle": "The best book",
+  "approved": true,
+  "temporarilyRejected": false,
+  "rejected": false,
+  "rejections": [],
+  "publishDate": "2022-10-14T17:36:15Z",
+  "downloadUrl": "https://www.mock-indexer.test/tor/download.php?tid=000000",
+  "downloadAllowed": true,
+  "releaseWeight": 0,
+  "preferredWordScore": 0,
+  "protocol": "torrent"
+}

pkg/readarr/testdata/system_status_response_ok.json

@@ -0,0 +1,31 @@
+{
+  "appName": "Readarr",
+  "version": "0.1.1.1320",
+  "buildTime": "2022-05-09T22:53:15Z",
+  "isDebug": false,
+  "isProduction": true,
+  "isAdmin": false,
+  "isUserInteractive": true,
+  "startupPath": "/app/bin",
+  "appData": "/config",
+  "osName": "alpine",
+  "osVersion": "3.16.2",
+  "isNetCore": true,
+  "isMono": false,
+  "isLinux": true,
+  "isOsx": false,
+  "isWindows": false,
+  "isDocker": false,
+  "mode": "console",
+  "branch": "develop",
+  "authentication": "none",
+  "sqliteVersion": "3.38.5",
+  "migrationVersion": 21,
+  "urlBase": "",
+  "runtimeVersion": "6.0.3",
+  "runtimeName": "netCore",
+  "startTime": "2022-10-14T17:26:21Z",
+  "packageVersion": "testing-e06fe51",
+  "packageAuthor": "[hotio](https://github.com/hotio)",
+  "packageUpdateMechanism": "docker"
+}