Add lineHeight support of placeholder for multiline text input (#23760)
Add lineHeight support of placeholder for multiline text input (#23760)

Summary:
After some refactor of text input attributes, we can now add style attributes  the same as text input's attributes, from https://github.com/facebook/react-native/issues/19002#issuecomment-467171589, user wants placeholder to support line-height , I think we can add it now for multiline text input.

[iOS] [Added] - Added lineHeight support of placeholder for multiline text input
Pull Request resolved: https://github.com/facebook/react-native/pull/23760

Differential Revision: D14320600

Pulled By: cpojer

fbshipit-source-id: ededeaa11560af089ca15ffc188e2e70db2ad7d4

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