Add eventCount property to TextInputKeyPressEventData type (#57331)

Summary:
Align `TextInputKeyPressEventData` type with: https://github.com/facebook/react-native/blob/116ea5955c374b1b6f2e62a47f194add96470081/packages/react-native/Libraries/Components/TextInput/TextInput.flow.js#L103
`TextInputKeyPressEventData` was missing the `eventCount` in the event payload.

## Changelog:

[GENERAL] [FIXED] - Add eventCount to TextInputKeyPressEventData type

Pull Request resolved: #57331

Test Plan:
Check fabric event emitter:
https://github.com/facebook/react-native/blob/618ef02f4a0da31d613bca40019f1abf511cbb1e/packages/react-native/ReactCommon/react/renderer/components/textinput/TextInputEventEmitter.cpp#L113

Reviewed By: javache

Differential Revision: D109693681

Pulled By: fabriziocucci

fbshipit-source-id: e79da2395d0e9e568cf9b1d06e81b809195d80dd

Author: pchalupa

packages/react-native/Libraries/Components/TextInput/TextInput.d.ts

@@ -501,6 +501,7 @@ export type TextInputSelectionChangeEvent =
  */
 export interface TextInputKeyPressEventData {
   key: string;
+  eventCount: number;
 }
 
 /**