Add experimental HCPP rendering mode to Android platform view docs

[jmagman]

What information needs to be added?

Description of mode is here: https://github.com/flutter/flutter/blob/master/docs/platforms/android/Android-Platform-Views.md
https://github.com/orgs/flutter/projects/201
Will be available in Flutter 3.44.

Where should this new content appear?

https://docs.flutter.dev/platform-integration/android/platform-views

I would like to fix this problem.

• I will try and fix this problem on docs.flutter.dev.

[jmagman]

Something like this:

#### Hybrid Composition++ (Experimental)

Hybrid Composition++ (HCPP) delegates layer compositing directly to the Android OS using an Android Hardware Buffer swapchain and `SurfaceControl` transactions. Instead of forcing the Flutter engine to process native views or relying on offscreen buffers, this perfectly synchronizes the Flutter UI with the native Android views.

* + high-performance scrolling without screen tearing.
* + reliable support for `SurfaceView` components.
* + accurate and high-fidelity touch input.
* - requires a device with Vulkan support running Android API 34 or later.

#### Opting into Hybrid Composition++

Hybrid Composition++ is currently an experimental mode and is available in Flutter 3.44. There are no new APIs to adopt, and you simply need to enable the flag to upgrade your existing platform views. 

HCPP has specific Android API and hardware requirements (Android API 34 or later and Vulkan support) Devices that do not meet these requirements will automatically fall back to the existing platform view behavior configured for the app.

You can test the new mode before it becomes the default rendering mode in the future using one of the following methods:

1. Pass the `--enable-hcpp` flag to your run command `flutter run --enable-hcpp`.
2. Add the following `<meta-data>` flag inside the `<application>` block of your `android/app/src/main/AndroidManifest.xml` file:
```xml
<meta-data
    android:name="io.flutter.embedding.android.EnableHcpp"
    android:value="true" />

There's more to tweak in here. Maybe @jwill can help?