Remove SparqlEndpointRdfStoreService

[natan-cox-cognizone]

It is only used in one project. We can move the class to that project.

[psiotwo]

@natan-cox-cognizone other candidates for decomissioning and moving to the project repos, unless there are other usages outside the CZ github You are aware of?

• Tdb2StoreService - only in esco-dsms - can be moved to esco-dsms
• InMemoryRdfStoreService - only in asquare - can be made package-default not to expose it outside
• SparqlEndpointDatabase - unused in Cognizone Github