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/java/com/github/damontecres/wholphin/util/ApiRequestPager.kt

@@ -166,6 +166,22 @@ class ApiRequestPager<T>(
         }
     }
 
+    /**
+     * Dumps the cache for all the pages at or after the given position and fetches a new page
+     */
+    suspend fun refreshPagesAfter(position: Int) {
+        val pageNumber = position / pageSize
+        cachedPages.asMap().apply {
+            keys.forEach { pageKey ->
+                if (pageKey >= pageNumber) {
+                    if (DEBUG) Timber.v("refreshPagesAfter: dropping %s", pageKey)
+                    remove(pageKey)
+                }
+            }
+        }
+        fetchPageBlocking(position, true)
+    }
+
     companion object {
         private const val DEBUG = false
     }