Add missing 'auto' value for overflow in StyleSheets

[JFs743]

Summary:

'auto' is a valid option distinct from all other options and currently requires to do overflow: 'auto' as any to avoid a Typescript error

Changelog:

GENERAL ADDED - Add 'auto' as a valid option to StyleSheet's overflow in types (already supported by CSS)

Test Plan:

Have an item with overflow set to 'auto' in a StyleSheet:
Before the fix:

• works, has a different behaviour than visible, hidden, scroll and undefined
• genereates a Typescript error TS2820: Type '"auto"' is not assignable to type '"visible" | "hidden" | "scroll" | undefined'.
  StyleSheetTypes.d.ts(98, 3): The expected type comes from property 'overflow' which is declared here on type 'ViewStyle | TextStyle | ImageStyle'
• requires a <any> cast or ts-ignore to remove the error

After the fix:

• no Typescript error
• no behavioral change
• no breakage for people using the <any> cast

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