Make `dns.question.name` opt-in in `dns.lookup.duration` metric

[NimrodAvni78]

Area(s)

area:dns

What's missing?

OBI is currently allows to produce the dns.lookup.duration as opt-in. we started of following the otel semconv by always adding the dns.question.name attribute on the metric. But we change it to be opt-in because of unbounded cardinality issues which causes issues for users.
OBI declares its own telemetry schema that inherits from the otel registry. but if we downgrade the existing requirement level from required to opt-in that is a breaking change since users will expect that label

Describe the solution you'd like

Since this metric is still in development and dns.question.name does have boundless cardinality i would like to propose to convert it to opt-in instead of required inside the otel semconv

Tip

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