Nuget Package with better ECDSA support (.Net framework)

[sseckler]

Is your feature request related to a problem or specific use case? Please describe.
Currently, the nuget package is built for net461. Because of this, some ECDsa support is not included, e.g., DotNetUtilities.GetECDsaKeyPair.
Example code

Describe the solution you'd like
Add an additional target for net 4.7 to the nuget package.

Describe alternatives you've considered
Leave as is, then the function from DotNetUtilities for ECDsa will not be available.

Product deployment

Additional context