Add optional lucky extensions for avram

[matthewmcgarvey]

This is where the code that combines Lucky and Avram will live that was taken from luckyframework/lucky#1620.

To get the same behavior in apps as there was before, requires will be changed.

require "lucky"

becomes

require "lucky"
require "avram"
require "avram/lucky"

That should be the only breaking change. The tasks should continue to work, but the ones removed from lucky will no longer be preloaded (lucky gen.model and lucky gen.resource.browser)

I organized the code in a way that Avram can be run without the lucky dependency if desired. For instance, lucky is not included as a dependency of Avram (it is a development dependency, though). So, in order to use require "avram/lucky", you must add lucky as a dependency or use in a lucky app.

[jwoertink]

I wonder if for the precompiled tasks, we just remove all of them. Then we somehow create a single command that builds all of them at development time. This would allow you to precompile some additional tasks like db.console since we'd know your final config at that time 🤔

In any case, I'll merge this now to get started on cleaning things up. I think this is going to help solve the param issue too, but that'll come a bit later.