scripts : add apple app validation scripts

This commit adds scripts that can validate the iOS, macOS, tvOS, and
VisionOS applications. The scripts create a simple test app project,
copy the llama.xcframework to the test project, build and archive the
app, create an IPA from the archive, and validate the IPA using altool.

The motivation for this is to provide some basic validation and
hopefully avoid having to manually validate apps in Xcode.

Author: danbev

scripts/apple/validate-apps.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+./scripts/apple/validate-ios.sh
+./scripts/apple/validate-macos.sh
+./scripts/apple/validate-visionos.sh
+./scripts/apple/validate-tvos.sh