Island components configuration and tabs

Problem/Motivation

Following 📌 Add the island configuration forms Active , some propositions:

• Have the configuration use Drupal ajax when saved
• Add a component flat list (not grouped), disabled by default in the components libraries.
• Do not assume undefined or stable status for components, use case is:
  • I add experimental components in my Ds for wip, I want a Display builder where I can play only with the experimental components and not see stable.
• ...