Add alt text support and rework image layout (#503)

* Add alt text support and rework image layout

* Add additional BottomSheet implementation to account for nested Composer modal

* Use mobile gallery layout on mobile web

* Missing key

* Fix lint

* Move altimage modal into the standard modal system

* Fix overflow wrapping of images

* Fixes to the alt-image modal

* Remove unnecessary switch

* Restore old imagelayoutgrid code

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Co-authored-by: Paul Frazee <pfrazee@gmail.com>

package.json

@@ -64,7 +64,7 @@
     "expo-build-properties": "~0.5.1",
     "expo-camera": "~13.2.1",
     "expo-dev-client": "~2.1.1",
-    "expo-image": "~1.0.0",
+    "expo-image": "^1.2.1",
     "expo-image-picker": "~14.1.1",
     "expo-localization": "~14.1.1",
     "expo-media-library": "~15.2.3",