Add option to delete media (#1014)

## Description
Adds a setting to enable "Media management" which adds a context menu
item to delete media. This is accessible using either the More button or
long clicking.

You can delete episodes, seasons, series and movies/videos.

If order for the option to appear the current user must have server-side
settings for "Allow media deletion from" enabled for the library and the
in-app setting under Settings->Advanced Settings->"Show media management
options".

### Related issues
Closes #104 

### Testing
Emulator

## Screenshots
### Context menu
![delete_context_2
Large](https://github.com/user-attachments/assets/cabc3c24-1b43-4f88-8d71-b7275f9eadc4)


### Confirmation
![delete_confirm
Large](https://github.com/user-attachments/assets/8036dde1-8a51-424b-bbdd-f2826dd3e0ab)

## AI or LLM usage
None

app/src/main/res/values/strings.xml

@@ -692,6 +692,8 @@
     <string name="no_subtitles_found">No remote subtitles were found</string>
     <string name="series_continueing">Present</string>
     <string name="in_app_screensaver">Use in-app screensaver</string>
+    <string name="delete_item">Are you sure you want to delete this item?</string>
+    <string name="show_media_management">Show media management options</string>
     <string-array name="backdrop_style_options">
         <item>@string/backdrop_style_dynamic</item>
         <item>@string/backdrop_style_image</item>