Add new Enum based on the spec for acknoledgement

[mr-zepol]

This adds an Enum for acknowledgement for licenses, this is to avoid issues when parsing and serializing, so it complies with the spec.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.02%	✅ 75.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (0a6732e)	6370	4758	74.69%
Head commit (d1dd865)	6384 (+14)	4767 (+9)	74.67% (-0.02%)

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 (#579)	20	15	75.00%

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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