Set License expression rather than URL

[thompson-tomo]

Is your feature request related to a problem? Please describe.
The licence type is not being populated on nuget & in the cyclonedx bom

Describe the solution you'd like
I would like the the license expression property to be populated as part of the nuget package

Additional context
Name should be: PolyForm-Noncommercial-1.0.0

[JanKallman]

We use the PackageLicenseFile today for the PolyForm-NC license text, but we will consider changing to PackageLicenseExpression

[thompson-tomo]

Thanks. Note license Url was deprecated: https://learn.microsoft.com/en-us/nuget/reference/nuspec#licenseurl