Missing properties in IssuedSecurityTokenParameters in version 6.0.0 preview1

**Describe the bug**
We have a custom issued token ws-trust binding which is using the class IssuedSecurityTokenParameters and ClaimTypeRequirement, which I cannot see is made publicly available in the nuget package.

1. ClaimTypeRequirement class is missing.
2. AdditionalRequestParameters property in IssuedSecurityTokenParameters is missing.
3. ClaimTypeRequirements property in IssuedSecurityTokenParameters is missing.
4. IssuerMetadataAddress property in IssuedSecurityTokenParameters is missing.
5. KeySize property in IssuedSecurityTokenParameters is missing.

Would it be possible to make these public?

**To Reproduce**
Steps to reproduce the behavior:
1. Create a .NET 6 class library project
2. Reference System.ServiceModel.Primitives 6.0.0-preview1.23060.3
3. Create an instance of IssuedSecurityTokenParameters and set properties KeySize and IssuerMetadataAddress
4. Add object to collections ClaimTypeRequirements and AdditionalRequestParameters

**Expected behavior**
Be able to set the "missing" properties in class IssuedSecurityTokenParameters and create instance of class ClaimTypeRequirement.