Improve Bullet complex color config validation

[nickofthyme]

Is your feature request related to a problem? Please describe.
Improve validation and handling of the ColorBandComplexConfig for Bullet charts.

Describe the solution you'd like
Currently this method to define the color bands is the least opinionated and most flexible. It would be ideal to validate the config that the user passes and fix/warn of any errors. Checks could include

• Validate continuous color ranges, no holes or overlapping ranges.
• Validate ranges fully cover the given domain
• Validate start and end of each range is consistent direction
• Validate direction/order of ranges is consistent across all range pairs
• Validate computed percentage values conform to all other validations
• Provided, filling or clamping as needed or practicable