Federated Catalog: Possibility to delete FederatedCacheNodes out of directory

[janpmeyer]

Currently the situation in the spi of the federated catalog is that you only can add nodes to your directory.

But dataspaces can be agile, so mabey some participant doesnt wanna stay in the dataspace or you just dont wanna crawl him. So mabey a new feature about deleting a node out of the FederatedCacheNodeDirectory could be very useful.

That the topic to delete a participant out of a federated catalog with cached data will be probably more complex then just deleting the node out of this directory, as i already tested this quick solution, but i think this feature will be needed.

What do you think about this and what steps need to happen to realize this?