Resizing and moving blocks

[yelhouti]

Thanks for the great library.
I am building an app that is similar to a video editor, and this chart helps a lot visualizing segments, I would love to be able to resize segments or drag and drop them in the same or a separate line.
Would you be interested in me implementing the feature and making a PR, or if this is out of scope I could make a Fork and start working from there.
Thanks in advance for the feedback.