fix(Camera) persist zoom when changing from bounds to centerCoordinate

[naftalibeder]

Description

Fixes #1592, which reported an issue caused by #1538. In sum:

• If the map is configured using bounds, and that is changed to use centerCoordinate without passing in a specific zoomLevel, the map now persists the zoom level extrapolated from the previous bounds.
• Fixed issue where passing in a new zero padding object ([0, 0, 0, 0]) was not causing the map to update, seemingly due to a bug in the iOS SDK.
• Created a unified example showcasing bounds/centerCoordinate/zoomLevel/padding, making it easier to see how they all work and transition together.

Checklist

• I have tested this on a device/simulator for each compatible OS
• I formatted JS and TS files with yarn lint
• (n/a) I updated the documentation yarn generate
• I mentioned this change in CHANGELOG.md
• (n/a) I updated the typings files (index.d.ts)
• I added/ updated a sample (/example)

Video

example2.mov

[ferdicus]

Looks good to me and as @schiller-manuel already verified in #1592, that his issue is resolved I'd merge this 👍🏿

Thanks 🙇🏿