net: Add get/set reuseport and get_localaddr/reuseaddr for TcpSocket

[zekisherif]

Motivation

Recently updated mio tcp sockets with getter/setter for SO_REUSEPORT and also added TcpSocket::get_localaddr and TcpSocket::get_reuseaddr.

This PR is just to make it available for tokio TcpSocket

[hawkw]

Overall, this seems good. However, I think we should change the naming scheme to match the rest of Tokio. Typically, idiomatic Rust doesn't prefix accessor functions with get_. For example, a similar property on TcpListener has a setter called set_nodelay and a getter that's just called nodelay:

tokio/tokio/src/net/tcp/stream.rs

Lines 379 to 381 in ce173fd

	pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
	self.io.get_ref().set_nodelay(nodelay)
	}

tokio/tokio/src/net/tcp/stream.rs

Lines 355 to 357 in ce173fd

	pub fn nodelay(&self) -> io::Result<bool> {
	self.io.get_ref().nodelay()
	}

Let's follow that style here for consistency with the rest of Tokio's API.

[hawkw]

this looks good to me!