Integrate bson, cbor2, configobj, ion, json5, msgpack plugins

[sundarnagarajan]

Is your feature request related to a problem? Please describe. Thanks for building this package. I am actively using it. I also wanted to use the configobj plugin (anyconfig_configobj_backend). When I installed anyconfig and anyconfig_configobj_backend (both latest tags from your github repo), I could not import anyconfig, because anyconfig tries to import anyconfig_configobj_backend and anyconfig_configobj_backend (inside configobj_py) tries to import anyconfig - curcular import.

I also tried out a few of your other plugins - bson, cbor2, ion, json5, msgpack and they also had similar problems.

Describe the solution you'd like I think it would be a good idea to integrate these plugins in the same way the toml plugin is integrated:

• Try to import the required module (if it fails in anyconfig.backend.__init__.py, plugin will be disabled with a warning
• Make small changes to main module in each plugin to avoid the circular import problem

Describe alternatives you've considered I have done the above for the following extensions: bson, cbor2, configobj, ion, json5, msgpack. My repo is: https://github.com/sundarnagarajan/python-anyconfig-integrated

Additional context If you like it, can you pull my changes, or would you prefer I send you a pull request?

[ssato]

Thanks a lot for your report! I'll look into the issue this weekend.

[ssato]

I worked fixing plugins not updated and cannot work with the latest anyconfig in the issue #152. And as far as I tested with these latest backends, it works without any problems.

Could you please check these plugins works with anyconfig?

[ssato]

I don't want moving everything into anyconfig itself and keep it small to make its maintenance easier as much as I can do. So these plugins will be kept outside of anyconfig unless there are any critical issues as you said.

I could not reproduce the issue you said, so could you please describe the steps to reproduce that?