Make max zoom level (scale) configurable

[magnusart]

The max zoom level is hardcoded in these places which limit maximum zoom level (scale) of 500%. I have some diagrams with quite a few nodes where this level of zoom is not enough to make the diagram readable. This diagram is an exception from the typical case, but it would be very helpful to be able to increase the zoom level (scale) in the plugin settings.

vscode-mermaid-chart/webview/src/App.svelte

Lines 88 to 92 in 911bf6c

	panzoomInstance = Panzoom(element, {
	maxScale: 5,
	minScale: 0.5,
	contain: "outside",
	});

vscode-mermaid-chart/webview/src/App.svelte

Lines 103 to 107 in 911bf6c

	panzoomInstance = Panzoom(element, {
	maxScale: 5,
	minScale: 0.5,
	contain: "outside",
	});