Add basic support for license expressions #307

Job	Run time
check_code_format	49s
check_licenses_net472 (App)	3m 23s
check_version_command (net6.0)	21s
check_version_command_net472	2m 37s
check_licenses_net472 (Tests)	3m 22s
check_version_command (net7.0)	35s
check_licenses (net6.0, App)	2m 7s
check_licenses_net472 (ProjectWithReferenceContainingLicenseExpression)	3m 23s
check_version_command (net8.0)	37s
check_licenses (net6.0, Tests)	30s
check_licenses (net6.0, ProjectWithReferenceContainingLicenseExpression)	35s
test (ubuntu-latest, net6.0)	2m 46s
test_windows (net6.0)	5m 21s
test (ubuntu-latest, net7.0)	3m 4s
test_windows (net7.0)	6m 24s
test (ubuntu-latest, net8.0)	1m 15s
check_licenses (net7.0, App)	1s
test_windows (net8.0)	6m 36s
test (macos-latest, net6.0)	1m 56s
check_licenses (net7.0, Tests)	1s
test_windows (net472)	7m 20s
check_licenses (net7.0, ProjectWithReferenceContainingLicenseExpression)	1s
test (macos-latest, net7.0)	2m 23s
test (macos-latest, net8.0)	1m 42s
check_licenses (net8.0, App)	1s
check_licenses (net8.0, Tests)	1s
check_licenses (net8.0, ProjectWithReferenceContainingLicenseExpression)	1s
	57m 12s

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