Adding norm operator to PyTorch

[aksrajvanshi]

Added norm operator to PtNDArray and PyTorch.

[codecov-io]

Codecov Report

Merging #692 (a9712fe) into master (b4a93e4) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #692      +/-   ##
============================================
- Coverage     68.88%   68.82%   -0.07%     
  Complexity     3980     3980              
============================================
  Files           464      464              
  Lines         18494    18506      +12     
  Branches       1983     1987       +4     
============================================
- Hits          12740    12736       -4     
- Misses         4732     4742      +10     
- Partials       1022     1028       +6     

Impacted Files	Coverage Δ	Complexity Δ
api/src/main/java/ai/djl/nn/core/Embedding.java	43.36% <0.00%> (-5.03%)	12.00% <0.00%> (ø%)
...c/main/java/ai/djl/mxnet/engine/MxSymbolBlock.java	80.45% <0.00%> (-4.51%)	42.00% <0.00%> (+2.00%)	⬇️
...gine/src/main/java/ai/djl/mxnet/engine/Symbol.java	84.21% <0.00%> (-2.83%)	21.00% <0.00%> (+1.00%)	⬇️
...i/src/main/java/ai/djl/ndarray/types/DataType.java	82.22% <0.00%> (-2.23%)	16.00% <0.00%> (-1.00%)
.../ai/djl/serving/http/ManagementRequestHandler.java	91.15% <0.00%> (-1.77%)	24.00% <0.00%> (-1.00%)
api/src/main/java/ai/djl/BaseModel.java	79.54% <0.00%> (-1.52%)	36.00% <0.00%> (-1.00%)
api/src/main/java/ai/djl/util/PairList.java	86.41% <0.00%> (-1.24%)	32.00% <0.00%> (-1.00%)
...modality/nlp/embedding/TrainableWordEmbedding.java	50.00% <0.00%> (-0.88%)	9.00% <0.00%> (ø%)
...o/nlp/embedding/GloveWordEmbeddingModelLoader.java	70.00% <0.00%> (-0.74%)	5.00% <0.00%> (ø%)
...src/main/java/ai/djl/mxnet/engine/MxNDArrayEx.java	86.20% <0.00%> (-0.38%)	88.00% <0.00%> (ø%)
... and 4 more

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