Make subtree tags useable for integrator / editor

[mhsdesign]

Subtask of #3732

With #4550 subtreetags were introduced. But currently there is no way to leverage them without using the core api.

Especially as the tags can be used for security (#5298) a Neos out of the box solution would be important to make this an actual feature.

One option is to extend NodeType schema by some "default tags" that will be set if a node of that type is created.
Though this opens the discussion again of #4484 which claims that this should better be done with node templates like template.tags = 'foo'.
Basically it is currently the way that only properties (and references bug) can be created with the node creation and thus default values would make sense. Everything else could be argued - as long as subtree tags cannot be set via CreateNodeAggregateWithNode are separate.

Other options would be: provide an editor to edit subtree tags? Or hack it into options.subtreeTags and evaluate it only via the Ui.