Add selection to TextInputChangeEventData in TypeScript types

[nsbarsukov]

Summary:

The native TextInput.onChange event now emits selection data (cursor location) on both iOS and Android, added in 162627a (#55044).

• Add selection to TextInput onChange event (native) #55044

The JS companion PR c1f5445 (#55043) added the corresponding types, but only to two of the three TypeScript/Flow type sources:

• Add selection types to TextInput onChange event #55043

Type source	Has selection?
TextInput.flow.js (Flow)	✅
ReactNativeApi.d.ts (generated API surface)	✅
TextInput.d.ts (legacy public .d.ts)	❌

The hand-written legacy TextInput.d.ts was missed, so consumers relying on it can't access selection from the onChange event even though native genuinely sends it. This PR adds the optional selection field there so all three type sources agree.

Changelog:

[GENERAL] [ADDED] - Add selection to TextInputChangeEventData in TypeScript types

Test Plan:

Type-only change. selection is now available and correctly typed on the onChange event:

<TextInput
  onChange={e => {
    // e.nativeEvent.selection is now typed as { start: number; end: number } | undefined
    console.log(e.nativeEvent.selection?.start, e.nativeEvent.selection?.end);
  }}
/>

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