Add basic support for license expressions #300

Job	Run time
test_windows (net6.0)	6m 7s
test_windows (net7.0)	6m 56s
check_code_format	38s
check_licenses_net472 (App)	2m 59s
check_licenses (net6.0, App)	35s
test_windows (net8.0)	6m 50s
check_licenses_net472 (Tests)	3m 8s
check_licenses (net6.0, Tests)	27s
test_windows (net472)	6m 3s
check_licenses_net472 (ProjectWithReferenceContainingLicenseExpression)	3m 1s
check_version_command (net6.0)	37s
check_licenses (net6.0, ProjectWithReferenceContainingLicenseExpression)	30s
check_licenses (net7.0, App)	32s
check_version_command (net7.0)	29s
check_version_command_net472	3m 24s
check_licenses (net7.0, Tests)	29s
check_version_command (net8.0)	20s
check_licenses (net7.0, ProjectWithReferenceContainingLicenseExpression)	30s
check_licenses (net8.0, App)	8s
test (ubuntu-latest, net6.0)	1m 52s
check_licenses (net8.0, Tests)	13s
test (ubuntu-latest, net7.0)	2m 8s
check_licenses (net8.0, ProjectWithReferenceContainingLicenseExpression)	22s
test (ubuntu-latest, net8.0)	1m 9s
test (macos-latest, net6.0)	1m 53s
test (macos-latest, net7.0)	2m 7s
test (macos-latest, net8.0)	1m 50s
	55m 17s

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