Consider using System.CommandLine package to parse dotnet-svcutil arguments

Address the `Additional remarks` of https://github.com/dotnet/wcf/issues/4705#:~:text=nologo%20%2D%2Dverbosity%20Verbose-,Additional%20remarks,-The%20short%20forms :

The short forms of the parameters/commands are very hard to see. The standard is to display short form|long form explanation, for example -d | --outputDir - Directory to create files in.
I would suggest using the [Sytem.CommandLine](https://www.nuget.org/packages/System.CommandLine/2.0.0-beta1.21308.1) package for command line parsing (and nice display of help text).