Block and components library performance

Problem/Motivation

Following #3530369: Make components from ancestor themes available I fear we can have performance issue loading all components with specific configuration and choices from UI Patterns.

Components

Components are defined by profile with configuration, should be easy to ensure cache, but first let measure performance impact to know if it's worth it.

Block

With configuration and flatten list, components are loaded the each time the same by Display Builder profile (configuration), entity_type and sometimes bundle:

• Entity view: Each bundle + profile = same components
• Views: Each profile = same components
• Page: Each profile = same components

So we can have 2 + 1 x entity bundle versions of components.

We should ensure they are cached for this context, even provide extra manual cache.