Canvas support followup

[techniq]

Some outstanding items after merging #295

• Font color inconsistency (ex. LineChart > Labels within points)
• Background inconsistency (ex. AreaChart > Radial)
• Fully rounded Bars (ex. BarChart > Single dimension)
• Font size issue with tabular-nums (ex. Pie Chart > Single value gradient with text)
• Gradients (LinearGradient and RadialGradient components)
  • How to handle objectBoundingBox vs userSpaceOnUse coordinate systems (like SVG)
  • Consider adding a new ConicGradient (not supported by SVG)
• PieChart tooltip (leverage HitCanvas via integration)
• Support stroke-current (ex. BarChart > Single dimension)
• ClipPath (clip())
• Improve Group (position, etc) ([Group] Fix positioning when using canvas layer #662)
• Pattern (createPattern())
• RadialGradient (createRadialGradient)
  • Need to find a solution to better handle global coordinates as shape coordinates (possibly explicit x/y that match applied shape)
• <Rect rx={...}>
• Stroked dash (ex. highlight line)

[techniq]

Pattern supported via #458

[techniq]

Closing as we track remaining as separate issues