gh-138171: Migrate iOS testbed location and add Apple build script (#138176)

Adds tooling to generate and test an iOS XCframework, in a way that will also facilitate
adding other XCframework targets for other Apple platforms (tvOS, watchOS, visionOS and 
even macOS, potentially).

---------
Co-authored-by: Hugo van Kemenade <[email protected]>

Author: freakboy3742

.github/CODEOWNERS

@@ -150,6 +150,7 @@ Lib/test/test_android.py      @mhsmith @freakboy3742
 # iOS
 Doc/using/ios.rst             @freakboy3742
 Lib/_ios_support.py           @freakboy3742
+Apple/                        @freakboy3742
 iOS/                          @freakboy3742
 
 # macOS

.gitignore

@@ -71,15 +71,15 @@ Lib/test/data/*
 /Makefile
 /Makefile.pre
 /iOSTestbed.*
-iOS/Frameworks/
-iOS/Resources/Info.plist
-iOS/testbed/build
-iOS/testbed/Python.xcframework/ios-*/bin
-iOS/testbed/Python.xcframework/ios-*/include
-iOS/testbed/Python.xcframework/ios-*/lib
-iOS/testbed/Python.xcframework/ios-*/Python.framework
-iOS/testbed/iOSTestbed.xcodeproj/project.xcworkspace
-iOS/testbed/iOSTestbed.xcodeproj/xcuserdata
+Apple/iOS/Frameworks/
+Apple/iOS/Resources/Info.plist
+Apple/testbed/build
+Apple/testbed/Python.xcframework/*/bin
+Apple/testbed/Python.xcframework/*/include
+Apple/testbed/Python.xcframework/*/lib
+Apple/testbed/Python.xcframework/*/Python.framework
+Apple/testbed/*Testbed.xcodeproj/project.xcworkspace
+Apple/testbed/*Testbed.xcodeproj/xcuserdata
 Mac/Makefile
 Mac/PythonLauncher/Info.plist
 Mac/PythonLauncher/Makefile