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/res/values/fa_strings.xml

@@ -45,4 +45,8 @@
     <string name="fa_ellipsis_vertical" translatable="false">&#xf142;</string>
     <string name="fa_filter" translatable="false">&#xf0b0;</string>
     <string name="fa_sliders" translatable="false">&#xf1de;</string>
+    <string name="fa_download" translatable="false">&#xf019;</string>
+    <string name="fa_clock" translatable="false">&#xf017;</string>
+    <string name="fa_bell" translatable="false">&#xf0f3;</string>
+    <string name="fa_check" translatable="false">&#xf00c;</string>
 </resources>