Update ONNX Gen AI jextract example

[ammbra]

1. Status Quo
The current ONNX Gen AI example requires end users to manually build the native library. A lot of files are needed only to build the native runtime, but not serving a need later on.

2. Problem

The native build instructions are subject to change when comes to prerequisites and the build from latest sources can also come with unresolved issues on the native side.

3. Fix

This pull request introduces a few changes in the prerequisites:

• Pre-download compatible releases of onnxruntime and onnxruntime-genai (the onnxruntime-genai is a wrapper over the native onnxruntime). Release archives have the structure:

onnxruntime-genai-0.14.0-osx-arm64/
├── LICENSE
├── README.md
├── SECURITY.md
├── ThirdPartyNotices.txt
├── include
│   ├── ort_genai.h
│   └── ort_genai_c.h
└── lib
   └── libonnxruntime-genai.dylib

onnxruntime-osx-arm64-1.26.0/
├── GIT_COMMIT_ID
├── LICENSE
├── Privacy.md
├── README.md
├── ThirdPartyNotices.txt
├── VERSION_NUMBER
├── include
│   ├── core
│   │   └── providers
│   │       ├── custom_op_context.h
│   │       └── resource.h
│   ├── coreml_provider_factory.h
│   ├── cpu_provider_factory.h
│   ├── onnxruntime_c_api.h
│   ├── onnxruntime_cxx_api.h
│   ├── onnxruntime_cxx_inline.h
│   ├── onnxruntime_env_config_keys.h
│   ├── onnxruntime_ep_c_api.h
│   ├── onnxruntime_ep_device_ep_metadata_keys.h
│   ├── onnxruntime_float16.h
│   ├── onnxruntime_lite_custom_op.h
│   ├── onnxruntime_run_options_config_keys.h
│   ├── onnxruntime_session_options_config_keys.h
│   ├── provider_options.h
│   └── webgpu_provider_factory.h
├── lib
│   ├── cmake
│   │   └── onnxruntime
│   │       ├── onnxruntimeConfig.cmake
│   │       ├── onnxruntimeConfigVersion.cmake
│   │       ├── onnxruntimeTargets-release.cmake
│   │       └── onnxruntimeTargets.cmake
│   ├── libonnxruntime.1.26.0.dylib
│   ├── libonnxruntime.1.26.0.dylib.dSYM
│   │   └── Contents
│   │       ├── Info.plist
│   │       └── Resources
│   │           ├── DWARF
│   │           │   └── libonnxruntime.1.26.0.dylib
│   │           └── Relocations
│   │               └── aarch64
│   │                   └── libonnxruntime.1.26.0.dylib.yml
│   ├── libonnxruntime.1.dylib -> libonnxruntime.1.26.0.dylib
│   ├── libonnxruntime.dylib
│   └── pkgconfig
│       └── libonnxruntime.pc
└── testdata
   └── libcustom_op_library.dylib

The user should manually move the libonnxruntime<release>.dylib in the onnxruntime-genai lib folder.

• Generate Java bindings for the downloaded onnxruntime-genai release using the
• Removes unnecessary variables in prompt method code and add a way to exit the from LLM conversation in call method.

I run tests through Github actions enabled in my fork.

• I confirm that I make this contribution in accordance with the OpenJDK Interim AI Policy.

---

Progress

• Change must not contain extraneous whitespace
• Change must be properly reviewed (no review required)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jextract.git pull/304/head:pull/304
$ git checkout pull/304

Update a local copy of the PR:
$ git checkout pull/304
$ git pull https://git.openjdk.org/jextract.git pull/304/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 304

View PR using the GUI difftool:
$ git pr show -t 304

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jextract/pull/304.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

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[openjdk]

@ammbra This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

Update ONNX Gen AI jextract example

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[mlbridge]

Webrevs

• 00: Full (43a46d13)