Possibility to highlight calendar events in different colors

[SeppPenner]

Is your feature request related to a problem? Please describe. We use the Spectre.Console calendar and wanted to highlight certain days in different colors. E.g. think of a work week (Monday to Friday is e.g. green, Saturday and Sunday would be e.g. yellow).

Describe the solution you'd like The possibility to use the HighlightStyle() function on a per-day basis with the calendar.

Describe alternatives you've considered None.

Additional context Nothing special here.

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