Vaadin Flow Spreadsheet Conditional Formatting dataFormat color support feature

[AndriiRevaEpicor]

Describe your motivation

We have a possibility to use dataFormat within Conditional Formatting to change value's color in the cell.
Apache POI support it but Spreadsheet is not.

Describe the solution you'd like

A good solution which I would to apply is to use dataFormat as string value as: #,##0_);[Red](#,##0) - which means if value less than zero then apply red color and parentheses.

Describe alternatives you've considered

The only solution for this time is Java API approach (e.g.: SheetConditionalFormatting.java). It's good but with dataFormat it will be more laconically.

Additional context

Link to related issue: #6819