feat(misc): add timer control to more meeting phases

[tianrunhe]

Description

Originated from this Slack message

Demo

Testing scenarios

• Poker meeting estimate phase

  • Start a poker meeting
  • Add some item to estimate
  • Advance to the estimate phase
  • See you can start a timer

• Action meeting agenda item phase

  • Start an action meeting
  • Add some agenda items
  • Advance to the agenda item phase
  • See you can start a timer

Final checklist

• I checked the code review guidelines
• I have added Metrics Representative as reviewer(s) if my PR invovles metrics/data/analytics related changes
• I have performed a self-review of my code, the same way I'd do it for any other team member
• I have tested all cases I listed in the testing scenarios and I haven't found any issues or regressions
• Whenever I took a non-obvious choice I added a comment explaining why I did it this way
• I added the label Skip Maintainer Review Indicating the PR only requires reviewer review and can be merged right after it's approved if the PR introduces only minor changes, does not contain any architectural changes or does not introduce any new patterns and I think one review is sufficient'
• PR title is human readable and could be used in changelog