Enable large heap (#1337)

## Description
This PR simply enables the `largeHeap` flag to request more memory from
the OS.

I am a bit embarrassed that I haven't added this before now, but I had
read that using `largeHeap` was a bandaid, not a solution. So I assumed
Wholphin was doing something incorrect memory-wise. But after crawling
through many, many heap dumps to analyze Wholphin's memory usage, and
after further research, enabling this does make sense for handling high
bitrate, high resolution videos. Furthermore, many other Jellyfin
clients and other video apps like Plex and Prime Video have this
enabled.

So since I am pretty confident that Wholphin doesn't have any memory
leaks, I feel good about enabling this.

### Related issues
I believe this will fix many of the bug reports about crashes during 4K
playback, but it's not a cure-all since it is up the device & OS to
allocate the max memory.
Fixes #333 
Fixes #826
Fixes #1189

### Testing
Shield 2019, Fire 4k Max

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/AndroidManifest.xml

@@ -45,7 +45,8 @@
         android:theme="@style/Theme.Wholphin"
         android:name=".WholphinApplication"
         android:usesCleartextTraffic="true"
-        android:networkSecurityConfig="@xml/network_security_config">
+        android:networkSecurityConfig="@xml/network_security_config"
+        android:largeHeap="true">
         <activity
             android:name=".MainActivity"
             android:exported="true"