feat: allow multiple template SPARQL queries for an object/item endpo…

[recalcitrantsupplant]

…int. Remove unused file based template queries - configuration was complicated with having to specify file paths - and not currently used by anyone. Only data repo template queries are now supported.

From dev documentation, to add a template SPARQL query, use the form:

PREFIX prez: <https://prez.dev/ont/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
INSERT DATA { GRAPH <https://prez/system> {
    [ a prez:TemplateQuery ;
        rdf:value """<template_queries>""" ;
        prez:forEndpoint "http://www.opengis.net/ogcapi-features-1/1.0/feature" ;
    ]
    }}

Prez will now handle multiple literal values for rdf:value and execute all of these queries, returning the graph merge of the result.

[ashleysommer]

looks great! I'm glad it wasn't too much code to change to enable this feature.

[github-actions]

🎉 This PR is included in version 4.3.0 🎉

The release is available on GitHub release

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