feat: Support new edge-to-edge enforcement introduced in Android 15 (API 35)

### Prerequisites

- [X] I have read the [Contributing Guidelines](https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md#creating-an-issue).
- [X] I agree to follow the [Code of Conduct](https://ionicframework.com/code-of-conduct).
- [X] I have searched for [existing issues](https://github.com/ionic-team/ionic-framework/issues) that already include this feature request, without success.

### Describe the Feature Request

When running an app targeting SDK 35 in an Android 15 device, now the app fills the whole screen (it no longer leaves some margins for the bottom Android buttons for example). This means that some content might be behind the Android buttons, making that content unclickable.

I'm not sure if the best solution is that cordova-android applies margins to the WebView so it doesn't fill the full screen, making it behave similar to how it behaves in Android 14, or it should be Ionic the one handling those margins (I guess using the "safe area"). I'd prefer the latter because it will look similar to a native Android app, that's why I open this issue.

Right now cordova-android only supports SDK 34, it still doesn't support SDK 35.

To reproduce the issue, just add this in your config.xml and run an app in a device with Android 15:

``

For now, this change can be disabled by adding an option in the themes.xml file, but this option is temporary and will be removed in the future:

`true`

More information about this change:

https://developer.android.com/develop/ui/views/layout/edge-to-edge
https://developer.android.com/about/versions/15/behavior-changes-15#edge-to-edge

### Describe the Use Case

The new edge-to-edge display should be supported, otherwise some content can become unclickable because it's behind the Android buttons.

### Describe Preferred Solution

I guess the easiest solution is to handle this case using the "safe area".

### Describe Alternatives

_No response_

### Related Code

_No response_

### Additional Information

_No response_

Reproduce the issue with android-targetSdkVersion set to 35 in config.xml on an Android 15 device, then review themes.xml and the linked Android edge-to-edge documentation. Determine whether the change belongs in the Android integration or Ionic safe-area handling; done means content remains usable around the Android system buttons without relying on the temporary opt-out setting.

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