WinForms: Allow detached legend to be redrawn programmatically

I think the issue described in #2131 can be resolved by making this function `public`

https://github.com/ScottPlot/ScottPlot/blob/4008bdf2c569277fcf839a5761d40d5c272b60bb/src/ScottPlot4/ScottPlot.WinForms/FormsPlotLegendViewer.cs#L40-L51

### Discussed in https://github.com/ScottPlot/ScottPlot/discussions/2131

<div type='discussions-op-text'>

<sup>Originally posted by **Z0ld3n** September 21, 2022</sup>
Hi, thanks for this amazing library.

I have a question. If I hide series programmatically (by changing .IsVisible in IPlottable) when the legend is detached it is not picking up state change automatically.  Is there a way to force refresh/update the legend when it is in a detached state other than force closing FormsPlotLegendViewer and opening a new one?</div>

	private void RefreshLegendImage()
	{
	FormsPlot.Refresh();
	Legend.UpdateLegendItems(FormsPlot.Plot, includeHidden: true);

	System.Drawing.Image originalImage = PictureBoxLegend.Image;

	PictureBoxLegend.Image = Legend.GetBitmap(false);

	if (originalImage is not null)
	originalImage.Dispose();
	}

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WinForms: Allow detached legend to be redrawn programmatically #2153

Discussed in #2131

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WinForms: Allow detached legend to be redrawn programmatically #2153

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Discussed in #2131

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