Re-add new tooltip component

[xhluca]

This is an updated attempt for: #940

Note #941 was also added to this PR in 6a18fd9

Related:

• Output bounding box to hover event data plotly.js#5512
• https://github.com/plotly/dash-docs/pull/1104

TODOs for demo:

• Image example that uses URLs
• Image example that reads images from file system and base64 encodes them
• Clientside callback example with URLs
• Example with loading state and a time.sleep(1) to simulate a long running callback
• Serverside callback example with a nicely formatted tooltip made with HTML and inline CSS with a little box shadow, similar to the style of the nytimes:
• Clientside callback example of ^

[alexcjohnson]

@xhlulu please drop package-lock.json from this PR, since you aren't updating package.json. If you do change package.json, note that dash core is now using node 16 / npm 7

[xhluca]

@xhlulu please drop package-lock.json from this PR, since you aren't updating package.json. If you do change package.json, note that dash core is now using node 16 / npm 7

Sure. I removed the commit that added package-lock.json and did a force push

[xhluca]

@alexcjohnson am I supposed to commit NAMESPACE changes as well?

[xhluca]

@alexcjohnson I feel this PR is ready for review. A few questions for review:

• any idea why the 27 tests are failing? are we still supporting 2.7?
• What name should I give it? It's currently called dcc.AbsoluteTooltip but i'm certain there's a better name than this.

[alexcjohnson]

Closing - will remake shortly in the monorepo