feat: return tcp.Address from listener, if exists

[AeroNotix]

• This is the more accurate and correct address of the listener
• Useful if you want to listen on port 0 to dynamically create listeners (think of unit/integration tests)

[mochi-co]

This looks good to me, but interested to see if anyone is aware of any potential risks

[AeroNotix]

This should always match what the original data was unless port 0 was selected. Don't think there should be any risk?

[coveralls]

Pull Request Test Coverage Report for Build 7294218994

• 1 of 3 (33.33%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 98.749%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
listeners/tcp.go	1	3	33.33%

Totals
Change from base Build 7294210300:	-0.04%
Covered Lines:	5527
Relevant Lines:	5597

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💛 - Coveralls

[mochi-co]

@AeroNotix As nobody else has any concerns, and I agree with your assessment, so it's getting merged. I think this is a great idea. Thank you very much!

[AeroNotix]

Thanks!