[Feature Request] DownstreamRestApiOptions.Clone should follow AcquireTokenOptions model

[brentschmaltz]

Since DownstreamRestApiOptions is not sealed, a derived class will find it hard to implement Derived.Clone().
see:

microsoft-identity-abstractions-for-dotnet/src/Microsoft.Identity.Abstractions/TokenAcquisition/AcquireTokenOptions.cs

Line 12 in 3de79ae

public class AcquireTokenOptions

[brentschmaltz]

#39