Adding flyTo interpolator option to CameraKeyframes

[chrisgervang]

Adds a "fly to" style camera transition for geospatial cameras using @math.gl/web-mercator. This is pretty useful when the camera changes by long distance. Similar to the version in deck.gl view state transitions.

API

new CameraKeyframes({
  interpolators: 'flyTo', // string applies to every transition
  timings: [0, 7000, 9000],
  keyframes: [usa, california, usa],
  easings: [easing.easeInOut, easing.easeInOut]
})

new CameraKeyframes({
  interpolators: ['flyTo', 'linear'], // or specify different option for each transition
  ...
})

[coveralls]

Pull Request Test Coverage Report for Build 846375068

• 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%

---

Totals
Change from base Build 836322689:	0.0%
Covered Lines:	2
Relevant Lines:	2

---

💛 - Coveralls