feat: tap to see next/previous image (#20286)

* feat(mobile): tap behavior for next/previous image

This change enables switching to the next/previous photo in the photo
viewer by tapping the left/right quarter of the screen.

* Avoid animation on first/last image

* Add changes to asset_viewer.page

* Add setting for tap navigation, disable by default

Not everyone wants to have tapping for next/previous image enabled, so
this commit adds a settings toggle. Since it might be confusing behavior
for new users, it is disabled by default.

* chore: refactor

* fix: lint

---------

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

mobile/packages/ui/showcase/pubspec.lock

@@ -227,10 +227,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: e3641ec5d63ebf0d9b41bd43201a66e3fc79a65db5f61fc181f04cd27aab950c
+      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
       url: "https://pub.dev"
     source: hosted
-    version: "1.16.0"
+    version: "1.17.0"
   path:
     dependency: transitive
     description:
@@ -328,10 +328,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: "522f00f556e73044315fa4585ec3270f1808a4b186c936e612cab0b565ff1e00"
+      sha256: ab2726c1a94d3176a45960b6234466ec367179b87dd74f1611adb1f3b5fb9d55
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.6"
+    version: "0.7.7"
   typed_data:
     dependency: transitive
     description: