feat: generate client for Serinus Applications

[francescovallone]

Allow the CLI to generate a HTTP Client easily usable from a Flutter application.

The following is an allowed way to do a request to a Serinus application using the generated client.

application_name.controller_name.route(path_parameters, query_parameters, body);

The path parameters by default are Strings, but if they are defined as other types in the route then they will be of that specific type.

All the calls are treated, for obvious reasons, as Future

[francescovallone]

The verbosity of the method can probably be a flag in the configuration file or in the command tbh:
verbose mode: getUsersDetailsByIdAndName
non-verbose (default): getUsersDetails

The flag will be --verbose and it can be overridden by the configuration in the pubspec.yaml file