feat(chips): Add keyboard navigation

[patrickrodee]

Add support for keyboard navigation for chips. Update ripple focus-within mixin behavior.

Demos: action chips, choice chips, filter chips, and input chips.

Fixes #2259

BREAKING CHANGE: Chips markup, adapters, foundations, and events have changed.

[codecov-io]

Codecov Report

Merging #4844 into develop will increase coverage by 0.05%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #4844      +/-   ##
===========================================
+ Coverage    98.86%   98.91%   +0.05%     
===========================================
  Files          119      119              
  Lines         5650     5822     +172     
  Branches       749      778      +29     
===========================================
+ Hits          5586     5759     +173     
+ Misses          63       62       -1     
  Partials         1        1

Impacted Files	Coverage Δ
packages/mdc-chips/chip/component.ts	99.07% <100%> (+1.63%)	⬆️
packages/mdc-chips/chip-set/component.ts	98.7% <100%> (+0.28%)	⬆️
packages/mdc-chips/chip/foundation.ts	100% <100%> (ø)	⬆️
packages/mdc-chips/chip-set/foundation.ts	100% <100%> (ø)	⬆️

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2 screenshots changed from develop on commit a1ad20c:

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2 Changed:

• spec/mdc-chips/classes/input.html

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2 Changed:

• spec/mdc-chips/classes/input.html

[abhiomkar]

Looks good overall, left few minor comments.

[abhiomkar]

Found a minor bug in the screenshot demos where pressing Right Arrow when on the last chip would remove the focus from that chip which makes all chip to lose focus. But expected at least one chip to have focus.

[patrickrodee]

Found a minor bug in the screenshot demos where pressing Right Arrow when on the last chip would remove the focus from that chip which makes all chip to lose focus. But expected at least one chip to have focus.

Ah nice, thanks. I've fixed that and added some tests for it.

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• spec/mdc-chips/classes/input.html

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[abhiomkar]

LGTM, few more comments.

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• spec/mdc-chips/classes/input.html