RFR: 7904049: Add LLM inference example to jextract samples

[Maurizio Cimadamore]

On Wed, 25 Jun 2025 15:58:28 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

> Please review this PR to add an LLM inference example to the jextract samples.
> 
> Thanks!

samples/onnx/OnnxGenerator.java line 125:

> 123:     public void close() throws Exception {
> 124:         arena.close();
> 125:         OgaDestroyGenerator(generator);

I wonder if we should `MemorySegment::reinterpret` to associate cleanup action to the various segments -- and then just call `arena.close()` from here?

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PR Review Comment: https://git.openjdk.org/jextract/pull/285#discussion_r2167093284