Add support for `DELETE/INSERT`, `DELETE`, `DELETE WHERE` and `DELETE DATA` update operations

[jaw111]

The following update operations give a SPARQL error: Unknown query typedelete error:

DELETE/INSERT

delete { ?s ?p ?o }
insert { ?s ?p ?o }
where { ?s ?p ?o }

DELETE

delete { ?s ?p ?o }
where { ?s ?p ?o }

DELETE WHERE

delete where { ?s ?p ?o }

DELETE DATA

delete data {
    <urn:example:subject> <urn:example:predicate> <urn:example:object> .
}

[BenjaminHofstetter]

@jaw111, thanks for your PRs. I merged them. What store are you using? Should I publish a new version with your changes?

I need to do more work on DELETE and INSERT stuff. For example, I need to write the changes back to the TTL file for file-based stores and handle insert/delete for stores with separate endpoints for mutations. But that takes some time.

[jaw111]

@BenjaminHofstetter I am using Dydra on current project.

It'd be great to have a new version published as I'm trying to encourage a few more team members to get hands-on with SPARQL and the notebooks are a great help!

[BenjaminHofstetter]

@jaw111 In version 1.0.5 updates should work. (I try to optimize setups with separate endpoints for updates and query). And it's not supposed on file endpoints.

[BenjaminHofstetter]

In version 1.0.9, I introduced a new feature that allows you to add an update endpoint to a connection. Starting from now, all update queries can be made using HTTP endpoints.