Customise corner radius for day selection

[gerchicov-vg]

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New Issue Checklist

• [x] Use the latest version of CalendarKit
• [x] I've read the Contribution Guidelines
• [x] I've searched for existing GitHub issues

Issue Description

In my particular case I need to make a corner radius smaller. And currently it requires to edit inner library code.

Code I'm using with CalendarKit

Result I am trying to achieve

As I understand this corner radius is set here: https://github.com/richardtop/CalendarKit/blob/master/Sources/Header/DaySelector/DateLabel.swift

    override public func layoutSubviews() {
        layer.cornerRadius = bounds.height / 2
    }

there is also an option private var style = DaySelectorStyle() which could contain an info about corner radius.