Create an iOS and macOS preset

[jathu]

Summary

• Create a macos, ios, and ios-simulator preset
• The flags are copied from scripts/build_apple_frameworks.sh. In an upcoming PR, I will replace that command with this preset

Test plan

CI +

$ cmake --preset macos && cmake --build cmake-out -j $(sysctl -n hw.ncpu)
$ cmake --preset ios && cmake --build cmake-out -j $(sysctl -n hw.ncpu)
$ cmake --preset ios-simulator && cmake --build cmake-out -j $(sysctl -n hw.ncpu)

cc @larryliu0820

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11111

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⏳ 6 Pending, 2 Unrelated Failures

As of commit 9ace4de with merge base f2fb351 ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts

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