### Godot version

4.2.dev 80de898d721f952dac0b102d48bb73d6b02ee1e8

### System information

OpenXR

### Issue description

The Godot 3 OpenXR plugin supported obtaining boundary/guardian information in order to obtain play space logic. While we do have a function in the `XRInterface` in Godot 4 that is supposed to retrieve this information (`get_play_area`) it is not implemented on the Godot 4 `OpenXRInterface`.

This logic needs to be ported.

### Steps to reproduce

Call `get_play_area`, be amazed by it not returning data :P

### Minimal reproduction project

Any XR project.
for (uint32_t i = 0; i < num_supported_extensions; i++) {
		if (supported_extensions[i].extensionName == p_extension) {
			return true;
		}
	}
	return false;
}
bool OpenXRAPI::is_extension_enabled(const String &p_extension) const {
	CharString extension = p_extension.ascii();
	for (int i = 0; i < enabled_extensions.size(); i++) {
		if (strcmp(enabled_extensions[i].ptr(), extension.ptr()) == 0) {
			return true;
		}
	}
	return false;
}
bool OpenXRAPI::is_top_level_path_supported(const String &p_toplevel_path) {