[ENHANCEMENT] PieChart: radius configuration added

[dchromik]

Description

Relates to perses/perses#4426

• Changed radius to inner and outer radius, inner is optional
• Radius was hard coded at 50 but ignored in FE where 90% was used, new default value is outer radius 90% and no inner radius
• Moved radii and color palette to Visual group
• Added migration from flat radius and color palette
• Looks to me like piechart was copied from time series chart, there are some unused values, marked them as deprecated as deleting them would mean a breaking change

Screenshots

Checklist

• Pull request has a descriptive title and context useful to a reviewer.
• Pull request title follows the [<catalog_entry>] <commit message> naming convention using one of the
  following catalog_entry values: FEATURE, ENHANCEMENT, BUGFIX, BREAKINGCHANGE, DOC,IGNORE.
• All commits have DCO signoffs.

UI Changes

• Changes that impact the UI include screenshots and/or screencasts of the relevant changes.
• Code follows the UI guidelines.