Complete issues fixes & workarounds

[andy-asi]

This PR is aimed to solve and ignore some of the issues raised by the lack of maintenance for this library which are:

• Fix key extractor warning
• Fix native drive warning
• Ignore deprecated methods warnings by adding (UNSAFE)
• Properly bind image events
• Properly spread flat list props

To use this PR, change your package.json from:

"react-native-image-gallery": "^2.1.5",

to:

"react-native-image-gallery": "archriss/react-native-image-gallery#152/head"

then run yarn or npm i

I made this PR for my own production app. Hope it might help anyone whose app depends on this library. Happy coding!