Add support for more packages pt1

[pmnoxx]

It may be a good idea to add support for more structures from std.

• use std::time::Instant
• use std::net::SocketAddr

[Aeledfyr]

As mentioned in the previous PR, this could be cleaned up by using the known_deep_size macro, since these are all constant-size.

For example, see the implementation for chrono: https://github.com/Aeledfyr/deepsize/blob/23065db143811324ada5aeb87bc4410cf832c6a5/src/external_impls.rs#L167-L172

[pmnoxx]

As mentioned in the previous PR, this could be cleaned up by using the known_deep_size macro, since these are all constant-size.

For example, see the implementation for chrono:

https://github.com/Aeledfyr/deepsize/blob/23065db143811324ada5aeb87bc4410cf832c6a5/src/external_impls.rs#L167-L172

@Aeledfyr Thanks, I updated the PR.

[Aeledfyr]

Looks good! Merging.