Add support for drush code generator

Hi @jurgenhaas
yes we'd gladly merge that feature if you're gonna open a MR

Regards,
aronne

I've added a first generator with templates which can be called with drush http_client_manager:service. The user gets asked a couple of questions and then a set of files is being created from the given answers.

Note: this is built for the latest version of the code generator, so Drush version 12 is required in this case.

This approach only covers a fraction of the possibilities that this amazing module provides, but it may be an easy starting point for new users. Of course, providing such a code generator generates some sort of default, which users are going to assume is THE way to use this module. I know, this can be opinionated and therefore, the review should really determine, if the output is what you want to deliver as a recommended way of usage.

Whether we want to make the code generator more sophisticated or leave it on its intro level is totally up to the maintainers. For my own use case, where I use it for ECA TV live sessions to show how http client manager and ECA can work together. this is sufficient.

I'm gonna upload the interdiff for the latest version.

And this is the whole patch.

Thank you @jurgenhaas for your valuable contribution.
Regards,
aronne

Automatically closed - issue fixed for 2 weeks with no activity.