uses-feature.version should be settable according to android documentation

[Happypig375]

https://developer.android.com/guide/topics/manifest/uses-feature-element#hw-features
version is used for vulkan features. This attribute operates similarly to glEsVersion and therefore should be similarly settable.

There is no other way to use this attribute property currently aside from reflection.

[Copilot]

Pull request overview

Enables setting the Android manifest <uses-feature android:version="..."> attribute via Android.App.UsesFeatureAttribute, aligning with Android documentation (notably for Vulkan feature version requirements).

Changes:

• Make UsesFeatureAttribute.Version publicly settable and wire it into the manifest mapping loader.
• Update manifest-attribute-codegen metadata so uses-feature.version is generated as writable/visible.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Mono.Android/Android.App/UsesFeatureAttribute.cs	Makes Version settable and adds a mapping setter so values specified in attributes are applied during manifest generation.
build-tools/manifest-attribute-codegen/metadata.xml	Changes metadata so uses-feature.version is no longer read-only (generated as writable).

Comments suppressed due to low confidence (1)

src/Mono.Android/Android.App/UsesFeatureAttribute.cs:33

• Making UsesFeatureAttribute.Version settable enables android:version emission, but manifest merging/deduplication currently treats <uses-feature> entries as unique only by Name or glEsVersion (see ManifestDocument.AddUsesFeatures). If an existing manifest already contains the same android:name (or multiple assemblies specify it), the new version value can be dropped, producing an incorrect manifest for Vulkan features. Consider updating the dedupe logic to also account for Version (and likely Required) or to merge/replace existing entries when version differs.

	public int Version { get; set; }

#if XABT_MANIFEST_EXTENSIONS
	static Xamarin.Android.Manifest.ManifestDocumentElement<UsesFeatureAttribute> mapping = new ("uses-feature");

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[jonathanpeppers]

There are examples on GitHub that set version:

• https://github.com/libsdl-org/SDL/blob/c20a058ff431d046c5806bd22aba0835b25d9904/test/android/cmake/AndroidManifest.xr.xml.cmake#L12-L14