refactor: copy/past mime-helpers

[jkowalleck]

followup of #1243

make implementation a copy-past of existing art: https://github.com/CycloneDX/cyclonedx-node-yarn/blob/main/src/_helpers.ts

this should make it easier for CycloneDX/cyclonedx-javascript-library#1162

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -1.92%	✅ 80.00% (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (b067232)	1320	1101	83.41%
Head commit (f175f57)	1329 (+9)	1083 (-18)	81.49% (-1.92%)

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 (#1246)	10	8	80.00%

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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