Add basic support for license expressions #306

Job	Run time
test (ubuntu-latest, net6.0)	1m 15s
test (ubuntu-latest, net7.0)	1m 18s
test (ubuntu-latest, net8.0)	1m 17s
test (macos-latest, net6.0)	2m 5s
check_code_format	39s
check_licenses_net472 (App)	1m 33s
test (macos-latest, net7.0)	2m 27s
check_licenses (net6.0, App)	34s
check_licenses_net472 (Tests)	3m 15s
test (macos-latest, net8.0)	2m 5s
check_licenses (net6.0, Tests)	36s
check_version_command (net6.0)	30s
check_licenses_net472 (ProjectWithReferenceContainingLicenseExpression)	3m 10s
check_licenses (net6.0, ProjectWithReferenceContainingLicenseExpression)	29s
check_version_command (net7.0)	25s
check_version_command_net472	2m 41s
check_licenses (net7.0, App)	34s
check_version_command (net8.0)	31s
test_windows (net6.0)	6m 49s
check_licenses (net7.0, Tests)	10s
test_windows (net7.0)	6m 52s
check_licenses (net7.0, ProjectWithReferenceContainingLicenseExpression)	34s
test_windows (net8.0)	6m 55s
check_licenses (net8.0, App)	1s
test_windows (net472)	6m 0s
check_licenses (net8.0, Tests)	1s
check_licenses (net8.0, ProjectWithReferenceContainingLicenseExpression)	1s
	52m 47s

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