Allow rendering variants directly from rendreable arrays

Problem/Motivation

Sometimes we could skip invoking the variant selection hook and render a selected variant directly if variant information is given (for example via the #variant SDC renderable array key).

Proposed resolution

Let's check if we can do it in ComponentVariantsHooks::preRenderComponent(https://git.drupalcode.org/project/component_variants/-/blob/1.0.x/src/H...) to convert to what Drupal\component_variants\TwigLoader\ComponentVariantLoader expects.

API changes

Ability to select variant on renderable creation stage.