Add reading rating to text summaries

Problem/Motivation

Reading Rating should also be able to rate text summaries on core formatted text with summary.

Remaining tasks

• Add the summary reading rating option to settings form
• If the setting is set, add the reading rating to the summary field - this can be independent of the main field

User interface changes

Yes:

• Settings form under form display per field that has a summary field
• If checked, add reading rating markup to summary field

API changes

None.

Data model changes

Add setting for to enable for summary field.