Strong typing for socket addresses

[appetrosyan]

Currently all socket addresses are stored as strings. This is not ideal, because we don't know if the configuration files should contain the protocol specifier or not. For example, there are many instances in the code, where a string check for presence of http:// is done, and a format pre-pend.

We should probably either use one of the std::net types, or (better), a custom type that can be converted into the types that we need.

[appetrosyan]

Could benefit from rust-lang/rust#82485

[s8sato]

I remember I reverted use of std::net::SocketAddr::V4 because it was not SCALE compatible

[appetrosyan]

I remember I reverted use of std::net::SocketAddr::V4 because it was not SCALE compatible

True. There's also the question of #[no_std].

The current best solution is to replace the OS-specific implementations of std::net::SocketAddr which remain binary-compatible with standard OS-specific networking libraries, with easily convertible replacements, which also reflect the use inside Iroha.