Compare over time default state

[Carla-Moz]

This PR begins the work on the Compare over Time component reflected in this ticket: Search: Add component for Compare over time

Right now it covers only the first two checkboxes below. The component is hidden until all work is completed. Please add the #comparetime to the path to see and test it. Please let me know if there's anything I can add to make reviewing this simpler.

• [x] Create default state
• [x] Create expanded state
• [ ] Handle checked and displayed selected revisions
• [ ] Time range dropdown
• [ ] Compare button functionality
• [ ] Edit feature for results page

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 98.82%. Comparing base (3714be8) to head (dcc466d).

Files	Patch %	Lines
src/components/Search/SearchOverTime.tsx	97.82%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## beta #616 +/- ## ========================================== - Coverage 98.84% 98.82% -0.02% ========================================== Files 63 64 +1 Lines 1383 1452 +69 Branches 215 230 +15 ========================================== + Hits 1367 1435 +68 - Misses 14 15 +1 Partials 2 2 ```

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[Carla-Moz]

@julienw, please review the changes. I'll handle the style overrides refactor in a separate PR. Thanks for your review!!