use java 19's FFI API (in preview)

[yuzawa-san]

jextract is manual for now. gradle is nightly

[codecov-commenter]

Codecov Report

Merging #55 (e0a53a9) into master (5a32be0) will decrease coverage by 0.28%.
The diff coverage is 95.09%.

@@             Coverage Diff              @@
##             master      #55      +/-   ##
============================================
- Coverage     77.16%   76.88%   -0.29%     
+ Complexity      266      265       -1     
============================================
  Files            37       37              
  Lines           959      956       -3     
  Branches         42       43       +1     
============================================
- Hits            740      735       -5     
- Misses          196      198       +2     
  Partials         23       23              

Impacted Files	Coverage Δ
.../java/com/jyuzawa/onnxruntime/EnvironmentImpl.java	42.85% <ø> (ø)
...n/java/com/jyuzawa/onnxruntime/OnnxOpaqueImpl.java	0.00% <ø> (ø)
...java/com/jyuzawa/onnxruntime/OnnxOptionalImpl.java	0.00% <ø> (ø)
...va/com/jyuzawa/onnxruntime/OnnxTensorByteImpl.java	40.00% <ø> (ø)
.../com/jyuzawa/onnxruntime/OnnxTensorDoubleImpl.java	40.00% <ø> (ø)
...a/com/jyuzawa/onnxruntime/OnnxTensorFloatImpl.java	100.00% <ø> (ø)
...ava/com/jyuzawa/onnxruntime/OnnxTensorIntImpl.java	40.00% <ø> (ø)
...va/com/jyuzawa/onnxruntime/OnnxTensorLongImpl.java	40.00% <ø> (ø)
...a/com/jyuzawa/onnxruntime/OnnxTensorShortImpl.java	40.00% <ø> (ø)
...in/java/com/jyuzawa/onnxruntime/OnnxValueImpl.java	76.92% <ø> (ø)
... and 18 more

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