Generated Enum Types Need to be Compiled

[jtimmons]

The types that are generated by the CLI tool are all compile-time only types aside from the enum type. Regular typescript enums contain both compile-time and runtime information and so need to be compiled into a js source in order to be correctly used.

If we switch to using const enums, then there is no need to compile the generated type file and it can behave more like a declaration file - which based on the structure of the output, seems like the original intent.