#3452497: Edit Any Prop … pick from a suggestion of either structured data reuse (`dynamic`) or a instantiated-out-of-thin-air matching field type (`static`)

Closes #3452497.

On top of !15 (merged), !16 (merged) and !27 (merged).

(Legend: = TODO, = working)

Goals

• PoC UI to change the expression used for a sourceType == dynamic prop value
• PoC UI to toggle between sourceType: from dynamic to static:field_item:… and back
• Get rid of experience_builder_entity_view_alter()
• Get adapter sources working too.
• Initial end-to-end functional test: fde818b8

Screencast demonstrating: https://drupal.slack.com/archives/C072JMEPUS1/p1716925610355849

Or try it locally:

vendor/bin/drush si standard --account-name=root --account-pass=root --yes
vendor/bin/drush pm:install experience_builder --yes
# navigate to /node/add/article and observe!

Non-goals

• Good UX
• Nested components
• Translations
• "default" component trees aka bundle-defined defaults (in the Capabilities Doc: "content type templates"), which this field ought to store the additions/overrides for; it should no repeat the defaults.
• API representation (JSON:API) or otherwise

MR contents

• New FieldForComponentSuggester service.
• Updates to the terrible widget, to illustrate the choices we could offer to the user, with it being VERY CLEAR that this is currently a UX
• EndToEndDemoIntegrationTest, to prove this works end-to-end, on a fresh install.

Reviewer guidelines

@f.mazeikis:

Is any part of this MR likely to be part of the XB in the long term? (edited)

Excellent question! I'll add a section like this going forward

• yes: the changes to DataType + FieldType + PropSource
• maybe: the new service + kernel test
• HELL NO, KILL IT WITH FIRE: FieldWidget + config/optional

config/optional/field.field.node.article.field_hero.yml

+uuid: 717f23f7-65ea-4e76-8d19-36743c246b01
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.node.field_hero
+    - node.type.article
+  module:
+    - image
+id: node.article.field_hero
+field_name: field_hero
+entity_type: node
+bundle: article
+label: Hero
+description: ''
+required: true
+translatable: false
+default_value: {  }
+default_value_callback: ''
+settings:
+  handler: 'default:file'
+  handler_settings: {  }
+  file_directory: '[date:custom:Y]-[date:custom:m]'
+  file_extensions: 'png gif jpg jpeg webp'
+  max_filesize: ''
+  max_resolution: ''
+  min_resolution: ''
+  alt_field: true
+  alt_field_required: true
+  title_field: false
+  title_field_required: false
+  default_image:
+    uuid: ''
+    alt: ''
+    title: ''
+    width: null
+    height: null
+field_type: image