refactor(statsd receiver): rename Statsd.UDPlistener => UDPConn

[Manbeardo]

Summary:

Later in this stack of diffs, I rename TCPlistener to Listener because it becomes a generic listener for all networks supported by net.Listen. That makes UDPlistener's naming stand out because:

• It isn't a listener. It's a *net.UDPConn.
• It isn't the UDP counterpart to Listener.

This diff renames it to UDPConn to improve clarity.

Test Plan:

Unit tests pass.

Stack created with Sapling. Best reviewed with ReviewStack.

• feat(statsd receiver): enable use of unix domain sockets #16421
• -> refactor(statsd receiver): rename Statsd.UDPlistener => UDPConn #16420
• chore(inputs.statsd): Refactor internal stats into their own struct #16419

[telegraf-tiger]

Thanks so much for the pull request!
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[Manbeardo]

!signed-cla

[telegraf-tiger]

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s390x.deb		linux_i386.tar.gz
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[srebhan]

@Manbeardo this PR does two things it renames the UDPlistener and introduces a stats substructure. Please split the PR into two separate things!

[Manbeardo]

This PR is stacked on top of #16419. I'm not sure why GitHub hasn't updated the diff, but the stats stuff has already been merged.

[srebhan]

@Manbeardo you need to rebase this PR on the latest master after #16419 is in to get rid of the additional diff...

[telegraf-tiger]

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