feat: environment - gather declared license information according to PEP639

[jkowalleck]

From python environments, gather additional declared license information
according to PEP 639 (improving license clarity with better package metadata).

New CLI switches for cyclonedx environment:

• --PEP-639: Enable license gathering according to PEP 639 (improving license clarity with better package metadata).
  The behavior may change during the draft development of the PEP.
• --gather-license-texts: Enable license text gathering.

In current state of implementation, --gather-license-texts has effect only if --PEP-639 is also given.

part of #570

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.08% (target: -1.00%)	✅ 94.59% (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (cba521e)	1034	1001	96.81%
Head commit (1cd1ef6)	1070 (+36)	1035 (+34)	96.73% (-0.08%)

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 (#755)	37	35	94.59%

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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