### Summary
There is a helper that exists in `react-testing-library` to query inputs by their `placeholder`. This PR adds that support.
You **could** achieve this by querying for a `placeholder` prop, or querying for react native `TextInput`s manually and then checking their props, but it felt cleaner to have this contained in the testing library itself. It will also allow you to bypass any other instances that may have a `placeholder` prop that aren't `TextInput`s.
If we don't want to expand the surface of the library further, I completely understand that and am fine with this being closed. Just seems like it may be useful and save some time for several scenarios =)
### Test plan
+ Render a `TextInput` with a `placeholder` prop
+ Query the test instance via `getByPlaceholder` for the input
+ Verify the test instance is found
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### Summary
Make `debug.deep` more usable by allowing it to print arbitrary JSON (and actually any) files. This proves handy when we want to debug async component which we want to snapshot after async operations:
```jsx
const { toJSON, getByName } = render(
<Button onPress={jest.fn} text="Press me" />
);
fireEvent.press(getByName('TouchableOpacity'));
await flushMicrotasksQueue();
debug.deep(toJSON());
```
### Test plan
added one
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### Summary
This actually uncovered some bugs, like lack of `onDoublePress` (lol XD) and enabled us to have better snapshots for deep rendering.
### Test plan
no new tests
Kacper Wiszczuk
