add setCurrentNode to qgslayertreeview

[ViperMiniQ]

QgsLayerTreeView has a method (setCurrentLayer) for setting the QgsLayerNode as active in the tree by passing the layer to it.

There is no method for selecting groups the same way, even though the method setCurrentLayer finds the QgsLayerTreeNode and passes it to a function which selects the node.

2 new methods are added:

setCurrentNode - a general way of setting active nodes, which both setCurrentGroup and setCurrentLayer will call. Also, since a layerTreeView.selectedNodes() method returns selected nodes, it would make sense to have a method for selecting them as well.

setCurrentGroup - to have an exact way of setting active groups alongside active layers, even though maybe having setCurrentNode only would be ideal. Removing setCurrentLayer would not make sense now, so adding this as well.

Would close #47337

[github-actions]

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit f836363)

[nyalldawson]

I think we should drop the redundant setCurrentGroup method, just to keep the API from becoming cluttered. Otherwise +1

[ViperMiniQ]

Figured as much, wasn't sure.

Removed setCurrentGroup.

[nyalldawson]

@ViperMiniQ this looks good, it's just the failing code format checks which need fixing now

[github-actions]

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[nyalldawson]

Superseded by #58822