Bricks has an implicit dependency on entity_reference_revisions

Problem/Motivation

While adding the first tests to Bricks, schema had to been added in #3009000-14: Write config schema.

 field.formatter.settings.bricks_nested:
-  type: field.formatter.settings.entity_reference_entity_view
+  type: field.formatter.settings.entity_reference_revisions_entity_view

That shows the dependency.

In #3068108: BricksFieldTypeTrait should be in bricks, not brick_revisions, so can be used in BricksTreeItem we added a test for bricks, without bricks_revision, that needed to use entity_reference_revisions to pass.

Proposed resolution

a) Check how we can avoid the dependency on entity_reference_revisions
or
b) Make the dependency to entity_reference_revisions explicit in bricks.info.yml and composer.json

Remaining tasks

Discuss.

User interface changes

API changes

Data model changes

Release notes snippet