Add JSON-LD to guess_format()

Now that the `rdflib` package provides the functionality formerly in the
package `rdflib-jsonld`, it would be helpful for the utility function
`guess_format` to recognize file extensions indicative of JSON-LD
content.

This patch adds recognition of two file extensions, preserving syntax of
the `SUFFIX_FORMAT_MAP` variable:
* `.json`
* `.jsonld`

The latter is in recognition of the IANA media type
`application/ld+json` reporting the `.jsonld` file extension.
References:
https://www.iana.org/assignments/media-types/application/ld+json
via https://www.iana.org/assignments/media-types/media-types.xhtml
via https://w3c.github.io/json-ld-syntax/#iana-considerations

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

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