Solve all todos in `contentrepository-90.php`

[mhsdesign]

There are way more todos declared in the source than real issues in this repo.

so just to give awareness to that.

Every comment that is NOT marked with -> compatible with ES CR Node (nothing to do) is missing a migration!

That includes all methods on the TraversableNodeInterface

rector/config/set/contentrepository-90.php

Lines 298 to 317 in efcb725

	/**
	* Neos\ContentRepository\Domain\Projection\Content\TraversableNodeInterface
	*/
	// getDimensionSpacePoint() -> threw exception in <= Neos 8.0 - so nobody could have used this
	// findParentNode() -> TraversableNodeInterface
	$rectorConfig->rule(NodeFindParentNodeRector::class);
	// findNodePath() -> NodePath
	// TODO: PHP
	// findNamedChildNode(NodeName $nodeName): TraversableNodeInterface;
	// TODO: PHP
	// findChildNodes(NodeTypeConstraints $nodeTypeConstraints = null, int $limit = null, int $offset = null): TraversableNodes;
	// TODO: PHP
	// countChildNodes(NodeTypeConstraints $nodeTypeConstraints = null): int;
	// TODO: PHP
	// findReferencedNodes(): TraversableNodes;
	// TODO: PHP
	// findNamedReferencedNodes(PropertyName $edgeName): TraversableNodes;
	// TODO: PHP
	// findReferencingNodes() -> threw exception in <= Neos 8.0 - so nobody could have used this
	// findNamedReferencingNodes() -> threw exception in <= Neos 8.0 - so nobody could have used this

As well as moving

rector/config/set/contentrepository-90.php

Lines 229 to 234 in efcb725

	// moveBefore()
	// moveAfter()
	// moveInto()
	// copyBefore()
	// copyAfter()
	// copyInto()

and creating nodes:

rector/config/set/contentrepository-90.php

Lines 212 to 214 in efcb725

	// createNode
	// createSingleNode -> internal
	// createNodeFromTemplate

And much more.