feat: couple classes and their serializes

[jkowalleck]

Deprecates .serialization.BomRefHelper and .serialization.LicenseRepositoryHelper

fixes #756

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.03%	✅ 91.95% (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (8c14a87)	4875	4559	93.52%
Head commit (0f09a7f)	4883 (+8)	4565 (+6)	93.49% (-0.03%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#757)	87	80	91.95%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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