Fix memory leak in mxnet layerNorm().

[pdradx]

Memory leaks in mxnet NDArrays when using layerNorm() because of reshaping parameters right in the model NDManager.

[zachgk]

The PR is failing the format check. Can you reformat it?

> File not formatted: /home/runner/work/djl/djl/engines/mxnet/mxnet-engine/src/main/java/ai/djl/mxnet/engine/MxNDArrayEx.java
  In order to reformat your code, run './gradlew formatJava' (or './gradlew fJ' for short)
  See https:/deepjavalibrary/djl/blob/master/docs/development/development_guideline.md#coding-conventions for more details

[codecov-commenter]

Codecov Report

Merging #1993 (5408b26) into master (bb5073f) will decrease coverage by 2.23%.
The diff coverage is 69.47%.

@@             Coverage Diff              @@
##             master    #1993      +/-   ##
============================================
- Coverage     72.08%   69.85%   -2.24%     
- Complexity     5126     5912     +786     
============================================
  Files           473      586     +113     
  Lines         21970    26219    +4249     
  Branches       2351     2846     +495     
============================================
+ Hits          15838    18314    +2476     
- Misses         4925     6525    +1600     
- Partials       1207     1380     +173     

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%)	⬇️
...odality/cv/translator/BigGANTranslatorFactory.java	33.33% <0.00%> (+8.33%)	⬆️
.../cv/translator/InstanceSegmentationTranslator.java	0.00% <0.00%> (-86.59%)	⬇️
...nslator/InstanceSegmentationTranslatorFactory.java	7.14% <0.00%> (-11.04%)	⬇️
.../cv/translator/SemanticSegmentationTranslator.java	0.00% <0.00%> (ø)
... and 508 more

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