Update wholphin-extensions with newer MpvPlayer (#1365)

## Description
Uses the newer version of `wholphin-extensions` which now has the Kotlin
code, so this PR removes the MPV Kotlin code from this repo. Also
updates gradle to use providers.

There are no user facing changes

### Dev notes

`wholphin-mpv` can be provided by:
1. [Fetching pre-built
binaries](https://github.com/damontecres/wholphin-extensions#pre-built-binaries)
(Preferred method for devs)
2. Building `wholphin-extensions` from
[source](https://github.com/damontecres/wholphin-extensions#build-from-source)
3. Using `wholphin-mpv-stub` (the new module added in this PR) which
allows for compiling Wholphin, but will throw exceptions if MPV is used
during runtime

### Related issues
Related to #1172 

### Testing
Emulator

## Screenshots
N/A

## AI or LLM usage
None

wholphin-mpv-stub/.gitignore

@@ -0,0 +1 @@
+/build

wholphin-mpv-stub/README.md

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+# wholphin-mpv-stub
+
+This is a non-functional stub implementation for the `wholphin-mpv` library in https://github.com/damontecres/wholphin-extensions.
+
+This provides the minimal API so that Wholphin can compile without `wholphin-mpv`, but any runtime usage will error out.

wholphin-mpv-stub/build.gradle.kts

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+plugins {
+    alias(libs.plugins.android.library)
+}
+
+android {
+    namespace = "com.github.damontecres.wholphin.mpv"
+    compileSdk {
+        version = release(36)
+    }
+
+    defaultConfig {
+        minSdk = 23
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles("consumer-rules.pro")
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro",
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.media3.exoplayer)
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.androidx.junit)
+    androidTestImplementation(libs.androidx.espresso.core)
+}

wholphin-mpv-stub/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

wholphin-mpv-stub/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>

wholphin-mpv-stub/src/main/java/com/github/damontecres/wholphin/mpv/MPVLib.kt

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+package com.github.damontecres.wholphin.mpv
+
+/**
+ * Stubs out MPVLib in wholphin-mpv
+ */
+object MPVLib {
+    fun setPropertyString(
+        key: String,
+        value: String,
+    ): Unit = throw MpvStubException()
+
+    fun setPropertyInt(
+        key: String,
+        value: Int,
+    ): Unit = throw MpvStubException()
+
+    fun setPropertyDouble(
+        key: String,
+        value: Double,
+    ): Unit = throw MpvStubException()
+
+    fun setPropertyBoolean(
+        key: String,
+        value: Boolean,
+    ): Unit = throw MpvStubException()
+}

wholphin-mpv-stub/src/main/java/com/github/damontecres/wholphin/mpv/MpvPlayer.kt

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+package com.github.damontecres.wholphin.mpv
+
+import android.content.Context
+import android.os.Looper
+import androidx.annotation.OptIn
+import androidx.media3.common.SimpleBasePlayer
+import androidx.media3.common.util.UnstableApi
+import kotlin.time.Duration
+
+/**
+ * Stubs out MpvPlayer in wholphin-mpv
+ */
+@OptIn(UnstableApi::class)
+class MpvPlayer(
+    private val context: Context,
+    private val enableHardwareDecoding: Boolean,
+    private val useGpuNext: Boolean,
+) : SimpleBasePlayer(Looper.getMainLooper()) {
+    override fun getState(): State = throw MpvStubException()
+
+    var subtitleDelay: Duration = throw MpvStubException()
+}

wholphin-mpv-stub/src/main/java/com/github/damontecres/wholphin/mpv/MpvStubException.kt

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+package com.github.damontecres.wholphin.mpv
+
+class MpvStubException : Exception("This build is using wholphin-mpv-stub which does not implement actual functionality")