ANY23-458 Improve extractor and writer information in Rover

[lewismc]

This PR addresses https://issues.apache.org/jira/browse/ANY23-458

PR address the following improved info to STDOUT. Note the improved info specifically for --extractors and --format flags.

    rover      Apache Any23 Command Line Tool.
      Usage: rover [options] input IRIs {<url>|<file>}+
        Options:
          -d, --defaultns
            Override the default namespace used to produce statements.
          -e, --extractors
            a comma-separated list of extractors, e.g. rdf-xml,rdf-turtle,
            etc. A complete extractor list can be obtained by calling ./any23
            extractor --list
            Default: [csv, html-embedded-jsonld, html-head-icbm, html-head-links, html-head-meta, html-head-title, html-mf-adr, html-mf-geo, html-mf-hcalendar, html-mf-hcard, html-mf-hlisting, html-mf-hrecipe, html-mf-hresume, html-mf-hreview, html-mf-hreview-aggregate, html-mf-license, html-mf-species, html-mf-xfn, html-microdata, html-rdfa11, html-xpath, ical, jcal, owl-functional, owl-manchester, rdf-jsonld, rdf-nq, rdf-nt, rdf-trix, rdf-turtle, rdf-xml, xcal, yaml]
          -f, --format
            a comma-separated list of writer factories, e.g.
            json,jsonld,nquads,notrivial,ntriples,trix,turtle,uri
            Default: [ntriples]
          -l, --log
            Produce log within a file.
          -n, --nesting
            Disable production of nesting triples.
            Default: false
          -t, --notrivial
            Filter trivial statements (e.g. CSS related ones). [DEPRECATED: As
            of version 2.3, use --format instead.]
            Default: false
          -o, --output
            Specify Output file (defaults to standard output)
            Default: java.io.PrintStream@2b2948e2
          -p, --pedantic
            Validate and fixes HTML content detecting commons issues.
            Default: false
          -s, --stats
            Print out extraction statistics.
            Default: false

[HansBrende]

@lewismc the --extractors improvement looks good, however the writer example won't work. The only reason notrivial can precede nquads is that notrivial is a delegating writer factory... i.e., it pre-processes the triples (to remove "trivial" triples) before passing them to the nquads writer.

[HansBrende]

(There is only 1 format, ultimately, that you write the output as, IIRC)