Initial trial of Designer side asset import + endpoint modif

Context 

As part of the Multilayer project, we need to establish an import process for the Designer side assets of dependencies. 

As a first step we should validate the current functioning of the import for Designer assets of dependencies. To better understand :
> What is the current behaviour 
> Outline possible evolutions 

As a second step, we will work with the UI team to validate a definite process for the import of Designer assets in the context of Multilayer  

To do
1. PoC => Set-up a testing environment with dependent projects at 3 levels. 
This should be a long term env, as it may be used by the UI team in the future 
Each project should contribute 

• Features 
• Layouts
• HTML elements (buttons) 

2. ENDPOINT => Review the current endpoint that recovers Designer assets to ensure that all the Designer assets from dependencies are loaded 
  

PoC Objectives : 

• UNDERSTAND : If I declare a dependency A, dependency A has a further dependency B, will I see the Designer assets from both A and B imported ?
• UNDERSTAND : (deployment order) If I have the same feature in the dependencies A and B (Feature X and Y), and each feature has a layout 
  > Will I see feature X as active, feature Y as overridden in modeller ? 
  > Will I see only the layouts for feature X ? 
  > Will I see the HTML elements for X and Y  

We will be able to investigate further questions with this PoC once the above are answered