Add basic support for license expressions #305

Job	Run time
check_code_format	36s
check_version_command (net6.0)	33s
check_licenses_net472 (App)	2m 34s
check_licenses (net6.0, App)	36s
check_licenses_net472 (Tests)	2m 36s
check_version_command_net472	3m 2s
check_licenses (net6.0, Tests)	21s
check_version_command (net7.0)	31s
check_licenses_net472 (ProjectWithReferenceContainingLicenseExpression)	3m 9s
check_licenses (net6.0, ProjectWithReferenceContainingLicenseExpression)	10s
check_version_command (net8.0)	2m 13s
check_licenses (net7.0, App)	8s
check_licenses (net7.0, Tests)	9s
test (ubuntu-latest, net6.0)	1m 20s
test_windows (net6.0)	5m 10s
check_licenses (net7.0, ProjectWithReferenceContainingLicenseExpression)	7s
test (ubuntu-latest, net7.0)	1m 3s
test_windows (net7.0)	7m 2s
check_licenses (net8.0, App)	1s
test (ubuntu-latest, net8.0)	1m 22s
test_windows (net8.0)	5m 34s
check_licenses (net8.0, Tests)	1s
test (macos-latest, net6.0)	2m 24s
test_windows (net472)	6m 34s
check_licenses (net8.0, ProjectWithReferenceContainingLicenseExpression)	1s
test (macos-latest, net7.0)	1m 39s
test (macos-latest, net8.0)	1m 33s
	50m 29s

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