Allow access groups to have custom email addresses

Problem/Motivation

The [webform_access:type:TYPE] tokens only include user email assigned to an access group which requires an account to be created for any email address that needs to be associated with an access group. There should be an easier way to add email accounts which are not associated with any user accounts to an access group

Proposed resolution

Allow access groups to have custom email addresses.

[webform_access:type:users] - Assigned user emails
[webform_access:type:admins] - Custom emails
[webform_access:type:all] - Assigned user emails and Custom emails

Remaining tasks

• Add Emails to access group
• Add update hook to update existing entities
• Update APIs to support ::getEmails and ::setEmails()
• Update webform_access.schema.yml
• Add Emails to group listing
• Write tests
• Create a change record
• Tag new beta release

User interface changes

Access group email addresses will be displayed on the group list and editable in the group edit form.

API changes

TBD

Data model changes

TBD

Release notes snippet

TBD