Proof of Concept Dsl for Entities and Sections - WIP

[erikareads]

Contributor checklist

• Bug fixes include regression tests
• Chores
• Documentation changes
• Features include unit/acceptance tests
• Refactoring
• Update dependencies

[erikareads]

Initial work for #47

[jimsynz]

Question: rather than:

sections = Spark.load(Impl)

use Spark.Dsl.Extension,
  sections: sections

Is it possible to do something like this instead?

use Spark.Dsl.Extension do
  entity ...
end

[erikareads]

Question: rather than:

sections = Spark.load(Impl)

use Spark.Dsl.Extension,
  sections: sections

Is it possible to do something like this instead?

use Spark.Dsl.Extension do
  entity ...
end

We probably can't do use Spark.Dsl.Extension that way for backward compatibility reasons,
however, since we're introducing use Spark for the meta-DSL anyway,
there's nothing stopping us from going:

defmodule MyNewDSL do
  use Spark
  entity ...
  
   section ...

   transformer ...

   patch ...
end

Since use Spark is new, there shouldn't be any backwards compatibility concerns.

I would need to investigate what would be required to provide that API.