[feat] add tripLayerKeyframe for Kepler Trip Layer support

[chrisgervang]

When a kepler json with an active trip layer is loaded, the setLayerAnimationTime can be animated with keyframes stored in redux using the following action. Applying the animation happens automatically within the worldview kepler hook.

Usage in user code:

dispatch(updateTripLayerKeyframes({
  timings: [0, 1000, 2000],
  keyframes: [
    {time: 1671000000000},
    {time: 1671001000000},
    {time: 1671002000000}
  ],
  easings: easing.linear
}));

[coveralls]

Pull Request Test Coverage Report for Build 920603728

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 920473214:	0.0%
Covered Lines:	2
Relevant Lines:	2

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💛 - Coveralls