Ability to re-name users created by integration apps

Issue Summary

Some add-ons (Slack notifications, for example) add a user to the Space permissions, to be granted with permissions required to function properly. Although this is expected, the user name can be confusing and misleading, which could cause an admin to revoke necessary permissions. To add more context, Chat notifications is the user used by the Slack integration, however, that's not easily identified by the user name.

Proposed Solution

• Provide users the ability to re-name users created by integrations, such as Chat Notifications; or
• Change the user created by the add-on to something more similar such as "Slack app", "Slack integration", "Slack notifications", etc.