half support for index_copy, copy and slice_scatter

[cccclai]

Summary: Add half support for 3 more ops: index_copy, copy, slice_scatter

Differential Revision: D56712670

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3404

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As of commit 9f5d7095a726fe828e930aa8d53d8c85b93092c8 with merge base 130d7e8e1d80d2a440c244ad94e88769c5910401 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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