TextInput component's right prop should accept any React.ReactNode content

**Is your feature request related to a problem? Please describe.**
I want to be able to show an `ActivityIndicator` as the `right` prop for the `TextInput` to show loading states.

**Describe the solution you'd like**
The `TextInput` component's `right` prop should accept any `React.ReactNode` content and render it on the right side of the input.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
This is what I would expect the final result to look like

react-native: 0.65.1
react-native-paper: 4.9.2
react-native-vector-icons: 8.1.0

repro: [snack example](https://snack.expo.dev/q_-DRFxH_)

Start at the TextInput component's `right` prop and use the linked Snack example to reproduce the requested loading-state case. Confirm that an ActivityIndicator can be supplied as `right` and appears on the input's right side; the payload does not name a source file or test to run.

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