Add drupal console generator command.

[Jaesin]

Fixes #6

[dawehner]

Still dislike that option names, it doesn't tell you that this is related with bundles at all, IMHO

[Jaesin]

It's a straight copy of the console generate:entity:config command except I needed to use a custom generator.

Unfortunately I couldn't just subclass the original command, I had to duplicate it just to set a different generator.

[Jaesin]

https://github.com/hechoendrupal/DrupalConsole/blob/master/src/Command/Generate/EntityConfigCommand.php

This command works for this use case but it adds files we don't need.

It would be possible to combine the two commands and use only one generator.

[Jaesin]

@dawehner, @arlina-espinoza Should we bring the console command into the CEB module? We could put the template files in templates/console or something like that.

[jmolivas]

@Jaesin I will take a look at this in order to have it ready to merge.

[jibran]

I think we should also check whether this is an existing entity or not.

[Jaesin]

That's a good idea.