[android] use Java primitive boolean for UriImageSource (#22040)

Context: https://cs.android.com/android/platform/superproject/main/+/main:libcore/ojluni/annotations/hiddenapi/java/lang/Boolean.java;l=109?q=boolean.java

Some internal APIs in MAUI were using `java.lang.Boolean` when they
could just use `boolean` instead.

Java `boolean` is a primitive type, while `java.lang.Boolean` is an
object (that can be null). This is similar to `bool` vs `bool?` in C#,
except Java does not have `struct`.

This avoids:

* JNI field lookup of `Boolean.TRUE` and `Boolean.FALSE` on startup

* JNI field reads of `Boolean.TRUE` and `Boolean.FALSE` on every
  `UriImageSource` creation

* Creating a C# instance of `Java.Lang.Boolean`, and the bookkeeping
  for reusing C# instances

I was also going to change `ImageLoaderCallback.onComplete`, but it is
listed as a public API.

This is a small improvement, but should help all `UriImageSource` on
Android.

src/Core/AndroidNative/maui/src/main/java/com/microsoft/maui/PlatformInterop.java

@@ -293,7 +293,7 @@ static PorterDuff.Mode getPorterMode(int mode) {
         }
     }
 
-    private static void prepare(RequestBuilder<Drawable> builder, Target<Drawable> target, Boolean cachingEnabled, ImageLoaderCallback callback) {
+    private static void prepare(RequestBuilder<Drawable> builder, Target<Drawable> target, boolean cachingEnabled, ImageLoaderCallback callback) {
         // A special value to work around https://github.com/dotnet/maui/issues/6783 where targets
         // are actually re-used if all the variables are the same.
         // Adding this "error image" that will always load a null image makes each request unique,
@@ -311,12 +311,12 @@ private static void prepare(RequestBuilder<Drawable> builder, Target<Drawable> t
             .into(target);
     }
 
-    private static void loadInto(RequestBuilder<Drawable> builder, ImageView imageView, Boolean cachingEnabled, ImageLoaderCallback callback) {
+    private static void loadInto(RequestBuilder<Drawable> builder, ImageView imageView, boolean cachingEnabled, ImageLoaderCallback callback) {
         MauiCustomViewTarget target = new MauiCustomViewTarget(imageView, callback);
         prepare(builder, target, cachingEnabled, callback);
     }
 
-    private static void load(RequestBuilder<Drawable> builder, Context context, Boolean cachingEnabled, ImageLoaderCallback callback) {
+    private static void load(RequestBuilder<Drawable> builder, Context context, boolean cachingEnabled, ImageLoaderCallback callback) {
         MauiCustomTarget target = new MauiCustomTarget(context, callback);
         prepare(builder, target, cachingEnabled, callback);
     }
@@ -328,7 +328,7 @@ public static void loadImageFromFile(ImageView imageView, String file, ImageLoad
         loadInto(builder, imageView, true, callback);
     }
 
-    public static void loadImageFromUri(ImageView imageView, String uri, Boolean cachingEnabled, ImageLoaderCallback callback) {
+    public static void loadImageFromUri(ImageView imageView, String uri, boolean cachingEnabled, ImageLoaderCallback callback) {
         Uri androidUri = Uri.parse(uri);
         if (androidUri == null) {
             callback.onComplete(false, null, null);
@@ -363,7 +363,7 @@ public static void loadImageFromFile(Context context, String file, ImageLoaderCa
         load(builder, context, true, callback);
     }
 
-    public static void loadImageFromUri(Context context, String uri, Boolean cachingEnabled, ImageLoaderCallback callback) {
+    public static void loadImageFromUri(Context context, String uri, boolean cachingEnabled, ImageLoaderCallback callback) {
         Uri androidUri = Uri.parse(uri);
         if (androidUri == null) {
             callback.onComplete(false, null, null);

src/Core/src/ImageSources/UriImageSourceService/UriImageSourceService.Android.cs

@@ -19,10 +19,7 @@ public partial class UriImageSourceService
 				{
 					var callback = new ImageLoaderCallback();
 
-					var cachingEnabled = uriImageSource.CachingEnabled
-						? Java.Lang.Boolean.True
-						: Java.Lang.Boolean.False;
-					PlatformInterop.LoadImageFromUri(imageView, uriImageSource.Uri.OriginalString, cachingEnabled, callback);
+					PlatformInterop.LoadImageFromUri(imageView, uriImageSource.Uri.OriginalString, uriImageSource.CachingEnabled, callback);
 
 					return callback.Result;
 				}
@@ -45,10 +42,7 @@ public partial class UriImageSourceService
 				{
 					var drawableCallback = new ImageLoaderResultCallback();
 
-					var cachingEnabled = uriImageSource.CachingEnabled
-						? Java.Lang.Boolean.True
-						: Java.Lang.Boolean.False;
-					PlatformInterop.LoadImageFromUri(context, uriImageSource.Uri.OriginalString, cachingEnabled, drawableCallback);
+					PlatformInterop.LoadImageFromUri(context, uriImageSource.Uri.OriginalString, uriImageSource.CachingEnabled, drawableCallback);
 
 					return drawableCallback.Result;
 				}