JNI support for multiple ptd files

[pytorchbot]

This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #14168 by @lucylq
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/lucylq/113/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/lucylq/113/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/lucylq/111/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/lucylq/113/orig
Differential Revision: D82072929
@diff-train-skip-merge

[pytorch-bot]

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❌ 1 New Failure, 2 Cancelled Jobs, 1 Unrelated Failure

As of commit 54713e0 with merge base e0dda90 ():

NEW FAILURE - The following job has failed:

• pull / android / build-llm-demo / linux-job (gh)
  /pytorch/executorch/extension/android/jni/jni_layer_llama.cpp:195:11: error: no viable conversion from 'std::vector<std::string>' (aka 'vector<basic_string<char>>') to 'std::optional<const std::string>' (aka 'optional<const basic_string<char>>')

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / unittest / macos / macos-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• periodic / test-models-linux (buck2, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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