Add support to react-native-web

[danychi]

Hi there! 👋

Firstly, thanks for your work on this project! 😊

I am working actively on a project that supports react-native and react-native-web, and I was getting some errors when using react-native-fast-image on the web. I am creating this PR to add in a simple way support to react-native-web.

I am aware that this PR is related to this other one, but I saw that the other PR was not getting any attention anymore 🤷

[NilsBaumgartner1994]

Please merge.

[katche70]

Hey, would be nice if merged