General reusable C# constructs for generated cmdlets

## Description
Basically, we'd put some C# code into the generator itself that would be available for all generated cmdlets. These would be reusable methods/classes/etc that help us handle Azure related information in our custom cmdlets. These can include:
- OData handling (create OData string out of components that would be exposed as parameters)
- Certificate creation/handling (cer, pfx, x509, pem, pkcs, to convert to base64 string for REST calls)

## Cost
(increases as list grows)