Enhance Sprotty JSX/TSX support

[glatuske]

Sprotty uses JSX/TSX for the graph views. Building components as described in React documentation (https://react.dev/learn/passing-props-to-a-component) is not possible due to normalization of attributes (normalizeAttrs). Also some SVG attributes cannot be passed as expected (e.g. attrs-font-size instead of font-size)

Current:
`@injectable()
export class NodeView extends ShapeView {

render(node: Readonly<SNodeImpl & CustomNode>, context: RenderingContext): VNode | undefined {
	return <g >
		{Tooltip({ type: node.type })}
		{Rectangle({ size: node.size, fill: node.fillColor })}
                    <text class-sprotty-label={true} attrs-font-size="7">{label.text}</text>
		{context.renderChildren(node)}
	</g>;
}

}`

Expected:
`@injectable()
export class NodeView extends ShapeView {

render(node: Readonly<SNodeImpl & CustomNode>, context: RenderingContext): VNode | undefined {
	return <g >
		<Tooltip type={node.type} />
		<Rectangle size={size: node.size} fill={node.fillColor} />
                    <text class-sprotty-label={true} font-size="7">{label.text}</text>
		{context.renderChildren(node)}
	</g>;
}

}`

[tortmayr]

Potential related issue: #178

[jbicker]

I will take care of this one.