Add support for full-screen dialogs

[fabriziocucci]

Is your feature request related to a problem? Please describe.
Not sure if I've missed it but, it seems full-screen dialog are currently not supported.

Describe the solution you'd like
It would be great to support full-screen dialogs as per MD3 spec.

Describe alternatives you've considered
Tried to customise the existing Dialog to work full-screen dialog with messy results.

Additional context

[fabriziocucci]

For the people landing on this feature request, while this is is being worked on, you can temporarily build a full-screen dialog by mixing and matching some of the existing components:

import { Modal } from "react-native";
import { Appbar, Button, Dialog } from "react-native-paper";

<Modal animationType="..." onRequestClose={dismiss} presentationStyle="overFullScreen" visible={...}>
    <Appbar.Header>
        <Appbar.Action icon="close" onPress={dismiss} />
        <Appbar.Content title="New event" />
        <Button onPress={save}>Save</Button>
    </Appbar.Header>
    <Dialog.Content>
        /* dialog content */
    </Dialog.Content>
</Modal>

NOTE: you could also use the Modal from react-native-paper but then you wouldn't be able to customise the animationType in case, for instance, you need a slide animation.

Really looking forward to get rid of this hack! :)

[sangamesh1439]

@lukewalczak Can I pick this up?