fix(iOS): idx out of bounds crash inside caretRectForPosition (#611)

# Summary

Fixes:  `idx` out of bounds crash inside `caretRectForPosition`

## Test Plan

1. Write in input: test
2. press enter
3. toggle center alignment 
4. Write in input: test
5. select whole text and delete it
6. press with cursor outside of simulator
7. press in input

The crash should not occur

## Screenshots / Videos

n/a

## Compatibility

| OS      | Implemented |
| ------- | :---------: |
| iOS     |    ✅     |
| Android |    ❌     |

## Checklist

- [ ] E2E tests are passing
- [ ] Required E2E tests have been added (if applicable)

Author: kacperzolkiewski

ios/enrichedInputTextView/EnrichedInputTextView.mm

@@ -28,7 +28,10 @@ - (CGRect)caretRectForPosition:(UITextPosition *)position {
   NSUInteger idx = [self offsetFromPosition:self.beginningOfDocument
                                  toPosition:position];
   NSString *text = self.textStorage.string;
-  NSRange paraRange = [text paragraphRangeForRange:NSMakeRange(idx, 0)];
+  NSRange paraRange = NSMakeRange(0, 0);
+  if (idx <= text.length) {
+    paraRange = [text paragraphRangeForRange:NSMakeRange(idx, 0)];
+  }
 
   // Non-empty paragraph gets its caret drawn the usual way.
   if (paraRange.length != 0) {