Add predicate listing endpoint

[recalcitrantsupplant]

The listing predicates are now provided at /annotation-predicates as an RDF Linked List.

Example response with default prez config:

@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix prez: <https://prez.dev/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix schema: <https://schema.org/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

prez:AnnotationPropertyList prez:descriptionList ( skos:definition dcterms:description schema:description ) ;
    prez:labelList ( skos:prefLabel dcterms:title rdfs:label schema:name ) ;
    prez:provenanceList ( dcterms:provenance ) .

closes #151

[jamiefeiss]

Would it make more sense to include this info in the root / endpoint instead?

Here's the current response from /:

<http://localhost:8000> prez:currentTBOXCacheSize 3112,
        3264,
        3277 ;
    prez:enabledPrezFlavour [ a prez:ProfilesPrez ;
            prez:link "/p" ],
        [ a prez:CatPrez ;
            prez:availableSearchMethod prez:exactMatch,
                prez:jenaFTName ;
            prez:link "/c" ],
        [ a prez:VocPrez ;
            prez:availableSearchMethod prez:exactMatch,
                prez:jenaFTName,
                prez:skosPrefLabel,
                prez:skosWeighted ;
            prez:link "/v" ],
        [ a prez:SpacePrez ;
            prez:availableSearchMethod prez:exactMatch,
                prez:jenaFTName ;
            prez:link "/s" ] ;
    prez:version "0.1.0.dev0" .

Also do we need to update this response? It still contains old search method config, and the tbox size adds another triple to this response every time it changes.

[recalcitrantsupplant]

What if anything from the current root response is being used? If nothing, we can populate with endpoint info from the endpoint reference data and also the annotation data.

[jamiefeiss]

With the current search changes, only the version and (soon) the enabled prez flavours. Sounds good to include the endpoint reference data as well.

[recalcitrantsupplant]

Too many commits in PR after rebasing, hard to see changes clearly. Will create new PR.