Add ActorExtractLinksHeaders

[wdantuma]

ActorExtractLinksHeaders

ActorExtractLinksHeaders is a ActorExtractLinks actor which adds links in link headers matching a regex pattern, usable for also following Auxillary resource links like "describedby" and "acl"

[CLAassistant]

All committers have signed the CLA.

[rubensworks]

Thanks @wdantuma, this looks really useful! I'll have a look at it next week.

[rubensworks]

@wdantuma I just had a look, and everything looks great to me!

The reason why the CI is still failing is because the new actor will have to be added as a dependency to engines/query-sparql-link-traversal and engines/query-sparql-link-traversal-solid: https://github.com/comunica/comunica-feature-link-traversal/blob/master/engines/query-sparql-link-traversal/package.json#L51
Could you look into adding it at those 2 locations?

[wdantuma]

@rubensworks i have added the dependencies to the new actor, thanks for the review

[rubensworks]

Thanks @wdantuma! Released as 0.4.0.

[RubenVerborgh]

Posterior note that we should thread carefully, as this changes query semantics wrt completeness.