feat(timeline): deprecate ruler slot

[markacianfrani]

Brief Description

Deprecated ruler slot. Now you can have rulers at the top or bottom, middle, both, whatever you desire.

Motivation and Context

Long requested feature, also dependency for additional features

Issues and Limitations

Types of changes

• [ ] Bug fix
• [x] New feature
• [ ] Breaking change

Checklist

• [ ] This PR adds or removes a Storybook story.
• [ ] I have added tests to cover my changes.
• [ ] Regressions are passing and/or failures are documented
• [ ] Changes have been checked in evergreen browsers

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Latest commit: 981998e979859cc1817ed24a54520724f312a68e

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[markacianfrani]

thank you, VRTs, for reminding me that this implementation will not work because it would break vertical scroll. RIP