ChartFill

A fellow programmer o mine has been using Chart since Objective-C days.
I had to update Chart to 4.1.0 due to Xcode 14.

However, there is a line of code
mfaSet.fill = [ChartFill fillWithColor:UIColor.redColor];
which is failing.

Was there a ChartFill previously?

## Charts Environment

**Charts version/Branch/Commit Number:4.1.0**
**Xcode version: 14.0**
**Swift version: 5.7**
**Platform(s) running Charts: iPad**
**macOS version running Xcode:12.5.1**

## Demo Project

ℹ Please link to or upload a project we can download that reproduces the issue.

Start by inspecting the Charts 4.1.0 API declarations for the mfaSet.fill assignment and ChartFill, using the failing line as the entry point. Confirm whether ChartFill is still available or what the current fill API requires, then verify the original assignment can be represented with the supported 4.1.0 interface.

Written by the indexing model from the issue text.