Implement rate limiting via slider drag_value?

[almarklein]

Rate limiting is introduced in #24 to improve the performance. Once plotly/dash-core-components#884 has landed and DCC has a new release, that approach could be considered instead. The UX differs a bit, but the code of this project would become simpler.

[almarklein]

Now that we included the axis ranges in the rate limiting mechanism, it's probably easier to keep things as they are.