Add support for .ktx images (#53991)

Summary:
Pull Request resolved: #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

Author: Fernando Gorodscy

.flowconfig

@@ -69,7 +69,7 @@ munge_underscores=true
 module.name_mapper='^react-native$' -> '<PROJECT_ROOT>/packages/react-native/index.js'
 module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/packages/react-native/\1'
 module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/packages/dev-middleware'
-module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\)$' -> '<PROJECT_ROOT>/packages/react-native/Libraries/Image/RelativeImageStub'
+module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\)$' -> '<PROJECT_ROOT>/packages/react-native/Libraries/Image/RelativeImageStub'
 
 module.system.haste.module_ref_prefix=m#