Add int16 support to PACK/UNPACK

[andresovela]

This PR adds int16 support for PACK and UNPACK ops.

bug=#2736

[andresovela]

Not sure what's the deal with the failing CI

[github-actions]

"This PR is being marked as stale due to inactivity. Remove label or comment to prevent closure in 5 days."

[andresovela]

Needs review

[github-actions]

"This PR is being marked as stale due to inactivity. Remove label or comment to prevent closure in 5 days."

[andresovela]

Needs review

[ddavis-2015]

@andresovela Thank you for your interest in TFLM (LRTM) and for submitting this PR!
Also, thank you for your persistence and perseverance.

This change looks good. Please make sure to merge with the latest main branch so there are no conflicts.

Also, another Google procedural requirement: All changed files should have the copyright year set the to current year (I know you submitted this last year). Only the current year should appear in the copyright.

[andresovela]

Addressed concerns :)

[ddavis-2015]

@suleshahid Everything looks good here.

[suleshahid]

Sorry for delayed review!

[mergify]

This pull request has been removed from the queue for the following reason: checks failed.

The merge conditions cannot be satisfied due to failing checks.

You may have to fix your CI before adding the pull request to the queue again.
If you update this pull request, to fix the CI, it will automatically be requeued once the queue conditions match again.
If you think this was a flaky issue instead, you can requeue the pull request, without updating it, by posting a @mergifyio requeue comment.

[suleshahid]

Ah, seems like Unpack int16 support was added in #3028 . Could you refactor?

[ddavis-2015]

Ah, seems like Unpack int16 support was added in #3028 . Could you refactor?

@andresovela

Please remove the unpack.cc changes in your PR and keep in the PR the unpack_test.cc changes you made, as the test code was not submitted in PR #3028.

[andresovela]

Hi @ddavis-2015, unfortunately priorities have changed at work and I no longer have time to work on this. Feel free to close the PR if it's already outdated.