SPARKNLP-825 Adding multilabel param

[danilojsl]

Adding multilabel param to all sequence and zero-shot classifiers

Description

Adding multilabel parameter and setMultiLabel setter

Motivation and Context

Activation is a bit too technical. So we added multilabel to allow users to better understand its purpose.

How Has This Been Tested?

Screenshots (if appropriate):

• Local Tests
• Google colab notebook

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Code improvements with no or little impact
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING page.
• I have added tests to cover my changes.
• All new and existing tests passed.

[coveralls]

Pull Request Test Coverage Report for Build 4951808959

• 0 of 7 (0.0%) changed or added relevant lines in 1 file are covered.
• 28 unchanged lines in 24 files lost coverage.
• Overall coverage decreased (-0.05%) to 65.791%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/scala/com/johnsnowlabs/nlp/HasClassifierActivationProperties.scala	0	7	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/main/scala/com/johnsnowlabs/nlp/annotators/common/Tagged.scala	1	66.67%
src/main/scala/com/johnsnowlabs/nlp/annotators/cv/util/io/ImageIOUtils.scala	1	51.35%
src/main/scala/com/johnsnowlabs/nlp/annotators/DateMatcherUtils.scala	1	86.57%
src/main/scala/com/johnsnowlabs/nlp/annotators/er/AhoCorasickAutomaton.scala	1	96.7%
src/main/scala/com/johnsnowlabs/nlp/annotators/er/EntityRulerModel.scala	1	89.6%
src/main/scala/com/johnsnowlabs/nlp/annotators/GraphExtraction.scala	1	77.74%
src/main/scala/com/johnsnowlabs/nlp/annotators/keyword/yake/YakeKeywordExtraction.scala	1	96.79%
src/main/scala/com/johnsnowlabs/nlp/annotators/ner/dl/NerDLApproach.scala	1	80.51%
src/main/scala/com/johnsnowlabs/nlp/annotators/ner/NerTagsEncoding.scala	1	72.73%
src/main/scala/com/johnsnowlabs/nlp/annotators/parser/dep/GreedyTransition/DependencyMaker.scala	1	79.89%

Totals
Change from base Build 4945586143:	-0.05%
Covered Lines:	8637
Relevant Lines:	13128

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💛 - Coveralls