Produce an alias for an xcframework's ios_sim_arm64 slice if available

[jszumski]

If apple.arm64_simulator_use_device_deps is False, an xcframework providing slices for ios-arm64 and ios-arm64_x86_64-simulator wouldn't select the second slice for an ios_sim_arm64 build.

ERROR: SomeFramework/BUILD.bazel:11:15: configurable attribute "actual" in //SomeFramework:SomeFramework-import-SomeFramework.xcframeworkdefault_vfs doesn't match this configuration. Would a default condition help?

Conditions checked:
 //SomeFramework:SomeFramework-import-SomeFramework.xcframework-ios_arm64
 //SomeFramework:SomeFramework-import-SomeFramework.xcframework-ios_simulator_x86_64

The configuration being built had these values:

FragmentOptions com.google.devtools.build.lib.analysis.config.CoreOptions {
  cpu: ios_sim_arm64
  host_cpu: darwin_arm64
  ...
}

FragmentOptions com.google.devtools.build.lib.rules.apple.AppleCommandLineOptions {
  apple_platform_type: ios
  apple_split_cpu: sim_arm64
  ios_multi_cpus: [sim_arm64]
  ...
}

This change emits a new condtion for //SomeFramework:SomeFramework-import-SomeFramework.xcframework-ios_simulator_arm64 that matches @build_bazel_rules_apple//apple:ios_sim_arm64 to the SomeFrameowrk.xcframework-ios-arm64_x86_64-simulator slice.

[mattrobmattrob]

This is a big QOL improvement! Most folks probably won't need the apple.arm64_simulator_use_device_deps feature at this point and it hasn't worked without it for me in the past. Awesome!

[jszumski]

@jerrymarino you added this originally, do you have any background context or know what might break that isn't covered by the tests?

[jerrymarino]

There were some very odd permutations of xcframeworks we handle and can try to run this code against with CI, it's unlikely all possible permutations are tested here

AFAIK it seems to create an alias to this here

[jerrymarino]

When turning on arm64_simulator_use_device_deps it gets you the option -

[luispadron]

Sweet one less flag to worry about

[mattrobmattrob]

Are you ready to merge this one, @jszumski?