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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[GregoryComer]

It looks like the demo app build is failing on this PR. @kirklandsign @lucylq can you take a look? Thanks.

[kirklandsign]

@lucylq curious how did it pass in main?

[lucylq]

@kirklandsign wondering if it's because when I CP'd this, the previous changes were not on the release branch.

[lucylq]

@GregoryComer likely have to rebase, we can also leave this out of the release branch and demo with the existing API.

[GregoryComer]

@GregoryComer likely have to rebase, we can also leave this out of the release branch and demo with the existing API.

Thanks. I'll try to rebase. Since it was in the tracker prior and is limited to Android, I'm okay to merge today if we can get it passing, though I'll defer to your judgement.

[lucylq]

if we pick this, also should pick this: #15067