feat: add HMMClassifier.fit multiprocessing

[eonu]

Add HMMClassifier.fit multiprocessing

Enables multiprocessed fitting for HMMClassifier if not providing pre-fitted HMMs.

Checklist

• I have added new tests (if necessary).
• I have ensured that tests and coverage are passing on CI.
• I have updated any relevant documentation (if necessary).
• I have used a descriptive pull request title.

[coveralls]

Pull Request Test Coverage Report for Build ef31ae31-4aa8-4b7d-b44d-e5f1b7f4af71

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 10 unchanged lines in 2 files lost coverage.
• Overall coverage remained the same at 82.59%

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Files with Coverage Reduction	New Missed Lines	%
models/hmm/classifier.py	2	91.13%
model_selection/_search.py	8	89.02%

Totals
Change from base Build b3bb5eef-fe2f-4ade-b335-8ade4deef105:	0.0%
Covered Lines:	1167
Relevant Lines:	1413

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💛 - Coveralls