Surface all quicktype options in the configuration

[schani]

All of quicktype's options are queryable dynamically somewhere - the CLI knows about the base options and the target languages know about theirs. We could add them to package.json in the build process. Or, if VSCode supports providing them at runtime, that would be even easier.

[schani]

See #10

[schani]

All infer* options are now configurable at least.

[dimitriblock]

What is about the option to export "only classes" in python?

[schani]

@dimitriblock That's one of the target language options that we can dynamically query. Please consider contributing - we'd love to help you implement this.