Add swiftpm manifest for locally built frameworks

[shoumikhin]

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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8795

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❌ 1 New Failure, 13 Pending

As of commit 5593596 with merge base 84273f4 ():

NEW FAILURE - The following job has failed:

• pull / test-pip-install-editable-mode-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 62f0a6cbbb739de04654379320ae399b635b3b5a5e4c2cb86fd2baac31ea7f49 /exec failed with exit code 2

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[shoumikhin]

@pytorchbot label "topic: not user facing"