Ability to set maximum decimal places in charts

**Is your feature request related to a problem? Please describe.**
I want to have a pie chart that shows percentages to the nearest 2 decimal places. As it stands, I can set the visualisation to have a minimum number of decimal places - but there's no clear way to set a maximum, the shown number of decimal places depends purely on the size of the chart.

**Describe the solution you'd like**
I would like a setting in the visualisation settings of any chart to specify the max number of decimal places alongside the other style settings

**Describe alternatives you've considered**
I cannot think of other alternatives for this

**How important is this feature to you?**
This is quite important for accessibility and consistency in reporting

**Additional context**
Add any other context or screenshots about the feature request here.

Start by locating the chart visualization settings and the existing minimum-decimal-place behavior described in the issue. Add a maximum-decimal-place setting for charts, including pie charts, and verify that displayed percentages respect it while existing style settings continue to work.

Written by the indexing model from the issue text.