fix: allow to array style prop

[heecheolman]

Summary

• Previously, styles in "Array" format were not being applied correctly.
• Therefore, now ensure that styles in "Array" format are correctly applied using StyleSheet.flatten.

Before: The opacity attribute is not correctly applied in gStyle. ❌

const gStyle = Object.assign({}, [{ opacity: 0.5 }]);
/* { 0: {opacity: 0.5 }} */

After: Now, the opacity attribute is correctly applied in gStyle. ✅

const gStyle = Object.assign({}, StyleSheet.flatten([{ opacity: 0.5 }]));
/* { opacity: 0.5 } */

const gStyle = Object.assign({}, StyleSheet.flatten([{ opacity: 0.5 }, { backgroundColor: 'red' }]));
/* { opacity: 0.5, backgroundColor: 'red' } */

Test Plan

0 key is not allow to ViewStyle

What's required for testing (prerequisites)?

What are the steps to reproduce (after prerequisites)?

Compatibility

OS	Implemented
iOS	✅❌
Android	✅❌

Checklist

• I have tested this on a device and a simulator
• I added documentation in README.md
• I updated the typed files (typescript)
• I added a test for the API in the __tests__ folder