Add support for .ktx images (#53991)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/53991

As part of D83474751 to migrate Store from arvr to xplat we discovered that ktx images are not setup correctly in xplat. Adding support for it in flow and jest

Changelog: [Internal]

Reviewed By: javache

Differential Revision: D83562581

fbshipit-source-id: 8c7205417dc24ca2d48a2e2fa1ca7dea40504c18