Add blurRadius support.

[chrise86]

React Native now supports blurRadius prop for Image for both Android and iOS, but this library does not seem to. It would be super useful to have this 👍

[sroze]

Started in #157. Anybody can pick it up where it is :)

[nica0012]

This would be incredible... Just switched over from RN Image to FastImage. I love the performance but my UI depended on the blur for some things

[solidfox]

I don't have the time at the moment but why not just steal facebooks implementation

[DylanVann]

I'm closing this PR which only works for iOS, if someone (possibly me) implements for Android I may re-open.

#157

[schumannd]

cant this be merged as an iOS-only feature for now?

[danilozano]

Any update on this? @DylanVann

[seunghyun-woo]

Any Updates?

[liran]

It is hard to imagine that blurRadius is not supported as yet.

[moh3n9595]

Any Updates?

[waheedakhtar694]

Any Updates?