Add basic support for license expressions #298

Job	Run time
check_licenses (net6.0, App)	29s
check_code_format	1m 9s
check_licenses (net6.0, Tests)	24s
check_version_command (net6.0)	33s
check_licenses_net472 (App)	2m 49s
check_licenses (net6.0, ProjectWithReferenceContainingLicenseExpression)	22s
check_version_command (net7.0)	26s
check_licenses_net472 (Tests)	2m 49s
check_licenses (net7.0, App)	20s
check_version_command (net8.0)	20s
check_version_command_net472	3m 3s
check_licenses_net472 (ProjectWithReferenceContainingLicenseExpression)	2m 43s
check_licenses (net7.0, Tests)	22s
check_licenses (net7.0, ProjectWithReferenceContainingLicenseExpression)	26s
test_windows (net6.0)	6m 59s
check_licenses (net8.0, App)	19s
test (ubuntu-latest, net6.0)	2m 8s
test_windows (net7.0)	6m 9s
check_licenses (net8.0, Tests)	1s
test (ubuntu-latest, net7.0)	1m 55s
check_licenses (net8.0, ProjectWithReferenceContainingLicenseExpression)	18s
test_windows (net8.0)	5m 9s
test (ubuntu-latest, net8.0)	1m 32s
test_windows (net472)	6m 1s
test (macos-latest, net6.0)	1m 42s
test (macos-latest, net7.0)	1m 30s
test (macos-latest, net8.0)	2m 59s
	52m 57s

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