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feat(dslx): introduce MeasureResolvedAddresses (#1388)

This diff introduces MeasureResolvedAddresses and other ancillary
functions that allow us to express measuring endpoints in a very simple
way and with less code than with previous dslx code.

As a result, we can deprecate a bunch of dslx functions (we will
actually clean them up at a later time).

While there, make StreamList simpler and more efficient: we can stream
w/o creating a goroutine. It suffices to create a sufficiently buffered
channel and fill it, and we can do all the work in the current
goroutine.

While there, fix a bug where QUICHandshake was mistakenly using the host
network rather than the measuring network to create UDP listening
sockets, which, well..., generated lots of confusion for me 😅 🤦.

While there, make sure the netemx.MustNewScenario function creates
HTTP/3 listeners for DNS servers. Previously, we did not create such
listeners, which however is necessary because we very often use DoH3.

While there, make sure we have issues for upcoming work.

Closes https://github.com/ooni/probe/issues/2618.

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