[2.0.0-beta1] ComponentFormBuilder: make it more dynamic

Problem/Motivation

1: In https://git.drupalcode.org/project/ui_patterns/-/blob/2.0.x/modules/ui_p...

  public function build() {
    $build = $this->buildComponentRenderable();
    return $build;
  }

  public function blockForm($form, FormStateInterface $form_state) {
    return $this->buildComponentsForm($form_state);
  }

  public function blockSubmit($form, FormStateInterface $form_state) {
    $this->submitComponentsForm($form_state);
  }

$form should be passed to the ComponentFormBuilderTrait methods, and/or the return of those methods should only target a key in $form and not replacing it entirely.

Not taking the provided $form into account may lead to extensibility problems if someone alters the form in other contrib or custom.

I had a problem years ago in a field formatter plugin where I had not called a parent method, it was ok in "manage display" but ot in layout builder because it was preparing additional stuff: https://git.drupalcode.org/project/file_extractor/-/commit/cf3b74dcc1312...

That's why I think not taking the provided $form into account may lead to problems.

2: In https://git.drupalcode.org/project/ui_patterns/-/blob/2.0.x/src/Form/Com...

  protected function getComponentConfiguration(): array {
    return $this->configuration['ui_patterns'] ?? [];
  }

  protected function setComponentConfiguration($configuration): void {
    $this->configuration['ui_patterns'] = $configuration;
  }

  ...

I think the "ui_patterns" key should be transformed into an argument, in case a form needs multiple component form elements.

3: In https://git.drupalcode.org/project/ui_patterns/-/blob/2.0.x/src/Form/Com...

  public function buildComponentRenderable($component_id = NULL, $source_contexts = []) {

This method is used for rendering, the trait is named ComponentFormBuilderTrait, maybe it should be placed in another trait? I understand that it is there because it is using the common method "$this->getComponentConfiguration()".

Proposed resolution

Remaining tasks

API changes