add uint16 to serialization

[JacobSzwejbka]

Summary: Support this type directly rather then converting to bits16

Differential Revision: D65915213

[pytorch-bot[bot]]

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6942

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As of commit 556136b6679407ca08d5596af459b85a96490686 with merge base eae0b04173e945e365173009508a15b578069285 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D65915213

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D65915213

[JacobSzwejbka]

@pytorchbot label "release notes: Add UInt16 dtype support for quant in serialization"

[pytorch-bot[bot]]

Didn't find following labels among repository labels: release notes: Add UInt16 dtype support for quant in serialization

[JacobSzwejbka]

@pytorchbot label "release notes: runtime topic: Add UInt16 dtype support for quant in serialization"

[pytorch-bot[bot]]

Didn't find following labels among repository labels: release notes: runtime topic: Add UInt16 dtype support for quant in serialization