memory leak in Pt indexing

[KexinFeng]

Description

A patch to the memory leak issue #2283, #2283, #2289
As pointed out in #2283, the native resources allocated by ai.djl.pytorch.jni.PyTorchLibrary#torchIndexInit was not released. This pr fixes it.

[codecov-commenter]

Codecov Report

Base: 72.08% // Head: 73.95% // Increases project coverage by +1.86% 🎉

Coverage data is based on head (085dacd) compared to base (bb5073f).
Patch coverage: 74.98% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2300      +/-   ##
============================================
+ Coverage     72.08%   73.95%   +1.86%     
- Complexity     5126     7401    +2275     
============================================
  Files           473      774     +301     
  Lines         21970    39749   +17779     
  Branches       2351     3436    +1085     
============================================
+ Hits          15838    29396   +13558     
- Misses         4925     8780    +3855     
- Partials       1207     1573     +366     

Impacted Files	Coverage Δ
api/src/main/java/ai/djl/modality/cv/Image.java	69.23% <ø> (-4.11%)	⬇️
...rc/main/java/ai/djl/modality/cv/MultiBoxPrior.java	76.00% <ø> (ø)
...rc/main/java/ai/djl/modality/cv/output/Joints.java	71.42% <ø> (ø)
.../main/java/ai/djl/modality/cv/output/Landmark.java	100.00% <ø> (ø)
...main/java/ai/djl/modality/cv/output/Rectangle.java	72.41% <0.00%> (ø)
...i/djl/modality/cv/translator/BigGANTranslator.java	21.42% <0.00%> (-5.24%)	⬇️
.../modality/cv/translator/ImageFeatureExtractor.java	0.00% <0.00%> (ø)
.../ai/djl/modality/cv/translator/YoloTranslator.java	27.77% <0.00%> (+18.95%)	⬆️
...ain/java/ai/djl/modality/cv/util/NDImageUtils.java	59.21% <0.00%> (ø)
api/src/main/java/ai/djl/modality/nlp/Decoder.java	63.63% <ø> (ø)
... and 717 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.