[ANALYZER-2391] - Data format is only applied to outer ring values in Sunburst chart
* Added JSDocs
* Added accessors for existing number style options
* Added the groupSizes field and accessor
* Setting a mask now does not compile it immediately, so that additional options that affect compilation (like groupSizes will) can be specified.
  The mask is compiled in #format, on first use.
[ANALYZER-2391] - Data format is only applied to outer ring values in Sunburst chart
* Implemented group separator.
* Slight refactor to the compileSectionPart function.