[FEATURE REQUEST] Add diagnostic information regarding background activities

[mneuwert]

In the new diagnostic screen we would like to see information about background tasks executed by internal scheduled task manager: new media detection and uploads, background refresh etc.

TASKS

• [ ] Research (if needed)
• [ ] Create branch feature/feature_name
• [ ] Development tasks
  • [ ] Implement whatever
  • [ ] ...
• [ ] Code review and apply changes requested
• [ ] Design test plan
• [ ] QA
• [ ] Merge branch feature/feature_name into master

PR

• App
• Library (if needed)