Proposal: Add support namespace for module

In a large repo, working with module need to add alias too much is quite annoyed and not good for organizing code.

I think better add support for namespace can bring more convenient for dev.

This is a basic example for namespace cross multi modules.

Example:

defmodule MyApp.A do
  namespace MyApp.DataProcessing

  def a do
  # do somethings
  end

  defmacro macroA(name, opts) do
    #...
  end
end

defmodule MyApp.B do
 namespace MyApp.DataProcessing

 def b do
  # somethings
 end
end

defmodule MyApp.C do
  namespace MyApp.DataProcessing

  def do_something(data) do
    data
    |> A.a()
    |> B.b()
  end

 A.macroA :wrapper, type: :json
end

LS can easily to suggest dev in a namespace.

Pros:

• Less typo like add alias for module.
• Make code clean than before.
• Better for LS suggest in case work in namespace.

Cons:

• Make complicated if bring support for import, require or use.
• Can make dev confused.