Add basic support for license expressions #309

Job	Run time
test (ubuntu-latest, net6.0)	1m 10s
test (ubuntu-latest, net7.0)	1m 18s
check_code_format	50s
check_licenses (net6.0, App)	33s
test (ubuntu-latest, net8.0)	1m 5s
check_licenses (net6.0, Tests)	39s
test (macos-latest, net6.0)	1m 45s
check_licenses_net472 (App)	2m 59s
check_licenses (net6.0, ProjectWithReferenceContainingLicenseExpression)	2m 15s
check_licenses_net472 (Tests)	3m 30s
check_licenses (net7.0, App)	53s
check_licenses_net472 (ProjectWithReferenceContainingLicenseExpression)	3m 17s
check_licenses (net7.0, Tests)	45s
check_licenses (net7.0, ProjectWithReferenceContainingLicenseExpression)	41s
check_licenses (net8.0, App)	2m 20s
check_version_command (net6.0)	23s
check_version_command_net472	3m 39s
check_licenses (net8.0, Tests)	33s
check_version_command (net7.0)	23s
check_licenses (net8.0, ProjectWithReferenceContainingLicenseExpression)	35s
check_version_command (net8.0)	23s
test_windows (net6.0)	8m 17s
test_windows (net7.0)	7m 55s
test (macos-latest, net7.0)	1m 48s
test (macos-latest, net8.0)	1m 20s
test_windows (net8.0)	6m 30s
test_windows (net472)	6m 48s
	1h 2m 34s

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