Add "access microcontent overview" permission, overhaul "administer microcontent"

Problem/Motivation

There are a number of modules in core (and contrib) that provide content entity types with permissions administer [entity type] and access [entity type] overview. Media, Node and Taxonomy are all examples of these, with the exception that Node also provides a "bypass node access" permission. Currently microcontent provides administer microcontent with the description "View the micro-content overview page".

Proposed resolution

• Provide a new "access microcontent overview" permission
• Provide an update path moving users from "administer microcontent" to "access microcontent overview"
• Expand the "administer microcontent" permission to provide full CRUD access to microcontent entities
• Add restrict access: true to "administer microcontent"

Remaining tasks

• Update permissions for micro_content_admin view
• Test CRUD access with "administer microcontent" permission
• Notify users of the change (CR, release notes, status message?)

User interface changes

API changes

Data model changes