Allow customize sonata-admin webpack build(s)

[wbloszyk]

Feature Request

Hello, I haven't contributing anything for a long time. In the meantime, I'm developing my own projects using symfony-ux. I think it would be a great idea to implement them in sonata-admin or at least allow using them in easy way.

Basic things

• [ ] reorganize and allow using admin assets as webpack build(s)
• [ ] prepare new 'layouts' and 'templates' config options integrated with template registry: sonata-project/adminlte2 (@SonataAdmin\ directory),
  sonata-project/adminlte3 (@SonataAdmin\adminlte3\ directory) (optional) sonata-project/bootstrap5 (@SonataAdmin\bootstrap5\ directory) builds (make it customizable and independed)

Layouts

• [ ] deprecated adminLTE 2 template
• [ ] add bootstrap 5 template (IMO this should be default layout in next major)
• [ ] add adminLTE3 template (optional)

Implements symfony UX

I'll leave it for later.

[github-actions[bot]]

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