feat(tab-indicator): Remove transitionend event handling

[kfranqueiro]

This reworks Tab Indicator's transition styles and logic such that we don't need to handle transitionend whatsoever. This allows pulling event handling out of its foundation/adapter outright, without even needing to hook anything up in the component.

Refs #2813

BREAKING CHANGE: Removes handleTransitionEnd foundation API. Removes [de]registerEventHandler adapter APIs.

[mdc-web-bot]

All 337 screenshot tests passed for commit d641cea vs. master! 💯🎉

[codecov-io]

Codecov Report

Merging #3337 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3337      +/-   ##
==========================================
- Coverage   98.14%   98.13%   -0.01%     
==========================================
  Files         123      123              
  Lines        5217     5194      -23     
  Branches      638      638              
==========================================
- Hits         5120     5097      -23     
  Misses         97       97

Impacted Files	Coverage Δ
packages/mdc-tab-indicator/foundation.js	100% <ø> (ø)	⬆️
packages/mdc-tab-indicator/constants.js	100% <ø> (ø)	⬆️
packages/mdc-tab-indicator/fading-foundation.js	100% <ø> (ø)	⬆️
packages/mdc-tab-indicator/index.js	100% <ø> (ø)	⬆️
packages/mdc-tab-indicator/sliding-foundation.js	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1245573...e17a889. Read the comment docs.

[mdc-web-bot]

All 349 screenshot tests passed for commit e17a889 vs. master! 💯🎉