Allow overriding special token flags in encode and decode methods

[siddvenk]

Description

The tokenizer python and rust apis allow users to pass boolean flags to encode and decode methods to override special token behavior set during initialization.

This change adds apis for the user to override the behavior in java similar to python and rust.

I also updated the naming of this flag for the decoding method to match the tokenizers naming.

[codecov-commenter]

Codecov Report

Merging #1855 (28a33be) into master (bb5073f) will decrease coverage by 2.31%.
The diff coverage is 64.61%.

@@             Coverage Diff              @@
##             master    #1855      +/-   ##
============================================
- Coverage     72.08%   69.77%   -2.32%     
- Complexity     5126     5544     +418     
============================================
  Files           473      527      +54     
  Lines         21970    24468    +2498     
  Branches       2351     2666     +315     
============================================
+ Hits          15838    17072    +1234     
- Misses         4925     6086    +1161     
- Partials       1207     1310     +103     

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%)	⬆️
...nslator/InstanceSegmentationTranslatorFactory.java	14.28% <0.00%> (-3.90%)	⬇️
.../cv/translator/SemanticSegmentationTranslator.java	0.00% <0.00%> (ø)
.../cv/translator/StyleTransferTranslatorFactory.java	40.00% <ø> (ø)
... and 424 more

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