[Proposal] [Small] Align viewport keyframes with deck.gl

[chrisgervang]

• Rename CameraKeyframes to MapViewKeyframes. The "fly to" interpolator isn't relevant to other views.
• Add OrbitViewKeyframes
• Add FirstPersonViewKeyframes

[chrisgervang]

While in there, for MapViewKeyframes, test that all viewState properties can be interpolated or are filtered out. For example, position: [number, number, number] and normalize: boolean aren't supported by popmotion interpolate out of box and throw a "not a valid mixer" error.