client to a JSON:API v1.0 service

 PONAPI::Client is a JSON:API compliant client; it should be able to communicate
 with any API-compliant service.
 .
 The client does a handful of checks required by the spec, then uses Hijk to
 communicate with the service.
 .
 In most cases, all API methods return a response document:
 .
 my $response = $client->retrieve(...);
 .
 In list context however, all API methods will return the request status and
 the document:
 .
 my ($status, $response) = $client->retrieve(...)