Support capturing of std::net types

[KodrAus]

Rebase of #721

Closes #711

I've taken the original implementation from #721 and tweaked it to maintain consistent behaviour between our internal capturing, and value-bag's. Thanks for originally working on this @JonathanWilbur!

[KodrAus]

I'll need to feature gate these on std, since they're not available in core until 1.77.

[KodrAus]

r? @Thomasdezeeuw

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[Thomasdezeeuw]

Code LGTM.

A lot of this types have been stabilised as core::net:: as well in 1.77 (released 21 March, 2024). Should we start keeping a lit of these kind of improvements we can do once we bump the MSRV?

[KodrAus]

That might be a good idea 👍 The other big one is Error, which is available from 1.81.0