Add json_array_elements_text function.

Andrew Dunstan <andrew@dunslane.net>

Commit: 5264d9154178d3aeaa0359b43a450298a7ce7281
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2014-01-29T20:39:01Z
Releases: 9.4.0
Add json_array_elements_text function.

This was a notable omission from the json functions added in 9.3 and
there have been numerous complaints about its absence.

Laurence Rowe.

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