* Add helper to parse border radius options
* feat: Implement borderRadius for bar charts
* chore: add demo of bar charts with border radius
* chore: document bar borderRadius
* chore: update typescript with bar borderRadius property
* fix horizontal borders test failing due to antialiasing
* chore: Add border-radius visual test
* Rename elements to mark as elements, i.e. Arc -> ArcElement
* Rename RectangleElement to BarElement
* Also updates options.elements.rectangle to options.elements.bar
* Fix some CC issues
* Merge _lookup, _lookupByKey, _rlookupByKey
* Remove TODO from types
* Merge TRBL logics
* Merge getMaximumWidth and getMaximumHeight