[llava][12/N] Move runner stats into its own header

[larryliu0820]

Stack from ghstack (oldest at bottom):

• -> #4499
• #4460

Summary: As titled, respecting new executorch namespace, getting runner prepared for multimodal LLM.

Test Plan:

Reviewers:

Subscribers:

Tasks:

Tags:

Differential Revision: D60573219

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/4499

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:white_check_mark: No Failures

As of commit 2b7fd5b7b890d00419aa0e6f2d06482d104d3172 with merge base 1e143339d463262694244c56f2fdb698ec28e3c5 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[larryliu0820]

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[larryliu0820]

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[larryliu0820]

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This pull request has been merged in pytorch/executorch@7a034522c888e5d3c724c0c79c90bd21eecee1c5.