Support ignoreRevs on Collection.delete() calls

[robross0606]

The HTTP API for ArangoDB supports revision checking on document removal via the If-Match header:

https://www.arangodb.com/docs/stable/http/document-working-with-documents.html#removes-a-document

However, the ArangoJS API doesn't expose this option. It should be exposed similar to how Collection.update() calls used to work prior to 7.x. Or, at least, how they're supposed to work (#707).

[pluma]

I'm closing this as a duplicate of #707 as that issue provides more additional information and the solution seems to be to re-implement the if-match header from v6.

[robross0606]

I'm not sure this should have been closed. I don't know if Collection.delete() on ArangoJS ever supported revision checks via If-Match. #707 is a bug ticket on Collection.update(). I had submitted this as a feature request on Collection.delete(). Just want to make sure we're tracking the distinction.