Add integration with Jellyseerr/Seerr (#558)

## Description
This PR add the ability to integrate with a [Jellyseerr/Seerr
server](https://github.com/seerr-team/seerr).

### Features
- Login to the Seerr server using API Key, Jellyfin credentials, or
local Seerr credentials
    - Separate Seerr logins per user profile
- Search Seerr from the search page
- Discover media from Seerr on the nav drawer `Discover` page
    - Also from movie, series, or person pages
- Seamless integration with existing media, i.e. selecting media found
from Seerr that already exists on the Jellyfin server, will go directly
to the regular media page
- Mostly consistent UI between Jellyfin media & Seerr media
- Submit requests to Seerr
- Cancel submitted requests

### Screenshots

![discover](https://github.com/user-attachments/assets/f830b48f-e2f1-43f4-9680-9c6d4e071765)

### Related issues
Closes #54

## Acknowledgements

The `app/src/main/seerr/seerr-api.yml` file is copied & modified from
https://github.com/seerr-team/seerr/blob/develop/seerr-api.yml. I hope
to try to upstream some of the changes in the future.

app/src/main/java/com/github/damontecres/wholphin/preferences/AppPreference.kt

@@ -871,6 +871,13 @@ sealed interface AppPreference<Pref, T> {
                 summaryOn = R.string.enabled,
                 summaryOff = R.string.disabled,
             )
+
+        val SeerrIntegration =
+            AppClickablePreference<AppPreferences>(
+                title = R.string.seerr_integration,
+                getter = { },
+                setter = { prefs, _ -> prefs },
+            )
     }
 }
 
@@ -932,6 +939,7 @@ val basicPreferences =
             title = R.string.more,
             preferences =
                 listOf(
+                    AppPreference.SeerrIntegration,
                     AppPreference.AdvancedSettings,
                 ),
         ),