[code-reflection] Integrated: Added hatless nbody example

[Gary Frost]

On Mon, 2 Dec 2024 12:32:24 GMT, Gary Frost <gfrost at openjdk.org> wrote:

> Mainly this allows us to test jextract and to compare numbers against an eventual hat implementation
>  
>  We are also setting the stage forn opencl backend implementation leaning on the extracted opencl.
>  
>  You will need to modify bld to jextract opencl and opengl  
>  
>  ```
>  java @bldr/hatlessrun nbody
>  ```

This pull request has now been integrated.

Changeset: ee2789e1
Author:    Gary Frost <gfrost at openjdk.org>
URL:       https://git.openjdk.org/babylon/commit/ee2789e1ed0aabf629ddd75e5424bd5346ce3f4a
Stats:     1236 lines in 10 files changed: 1233 ins; 0 del; 3 mod

Added hatless nbody example

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PR: https://git.openjdk.org/babylon/pull/288