Feature: Readonly mode for umb-collection element

[madsrasmussen]

Description

This PR adds readonly mode to the umb-collection element

General concept:

• The collection context includes a ReadOnlyStateManager that keeps track on read-only states.
• A state is added to the manager when the readonly attribute gets set on the umb-collection element.
• A new condition has to be added so extensions can check if a workspace is read-only. The condition is currently added to create actions so they only appear when a collection is writable.

Notice: I have added a new workspace view for a "Content collection". A collection based on a content type with a data type configuration and variable data. It is currently a duplication of the more generic named "workspace-view-collection".

How to test

• Add the readonly attribute to the element through developer tools

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)