[timeseries] add probability distribution support for timeseries

[Carkham]

Description

The distribution package provides the DJL implementations of distribution in mxnet and pytorch. It contains parameterizable probability distributions and sampling functions, which allows the construction of probability prediction. This package generally follows the design of the gluonts package.

[codecov-commenter]

Codecov Report

Base: 72.08% // Head: 69.66% // Decreases project coverage by -2.42% ⚠️

Coverage data is based on head (d821993) compared to base (bb5073f).
Patch coverage: 68.19% of modified lines in pull request are covered.

❗ Current head d821993 differs from pull request most recent head 9349693. Consider uploading reports for the commit 9349693 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2025      +/-   ##
============================================
- Coverage     72.08%   69.66%   -2.43%     
- Complexity     5126     5957     +831     
============================================
  Files           473      596     +123     
  Lines         21970    26468    +4498     
  Branches       2351     2877     +526     
============================================
+ Hits          15838    18440    +2602     
- Misses         4925     6643    +1718     
- Partials       1207     1385     +178     

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 510 more

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