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

* Add initial Readarr support

* Readarr working with MaM

* feat(clients): readarr add tests

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"
+}