[amp-date-countdown:1.0] Bento tracking issue

**Open tasks:**

Completed:
- [x] Initial [Design Doc](https://docs.google.com/document/d/1INUhhNEyVXArtNCuAG-y9evhV_3QoNwRf0GmrGTfEDE/edit?usp=sharing) - Reviewed
- [x] Preact Component Implementation - https://github.com/ampproject/amphtml/pull/30092 - Merged
- [x] Preact Storybook - https://github.com/ampproject/amphtml/pull/30227 - Merged
- [x] AMP Component Implementation - https://github.com/ampproject/amphtml/pull/30386 - Merged
- [x] New method for handling templates (related to https://github.com/ampproject/amphtml/pull/30228) - Handled in https://github.com/ampproject/amphtml/pull/30386 - Merged
- [x] Storybook Examples - https://github.com/ampproject/amphtml/pull/30561 - Merged
- [x] Automated Tests - https://github.com/ampproject/amphtml/pull/30386 - Merged
- [x] Count up issue for Bento to match with AMP - https://github.com/ampproject/amphtml/issues/30197, https://github.com/ampproject/amphtml/pull/32047 - merged
- [x] Add validator for 1.0 - https://github.com/ampproject/amphtml/pull/33480

In Progress:

Not Started:
- [ ] Update design doc per Final Implementation - Not Started
- [ ] Counts down smoothly when transitioning to negative numbers - Not Started
- [ ] Ticks once when starting as a negative number - Not Started

Documents:
[Design Doc](https://docs.google.com/document/d/1INUhhNEyVXArtNCuAG-y9evhV_3QoNwRf0GmrGTfEDE/edit?usp=sharing)