Remove all redundant questions from a DNS message, and parses the first question into a list of labels.

Telemetry events

[erldns, pipeline, questions]

Emitted when the questions pipe trims multiple questions down to one (only the first question is processed).

• Measurements: #{count => non_neg_integer()} — number of questions removed
• Metadata: #{host => host(), questions => [dns:query()]}