feat(tcp): make `TCP_NODELAY` the default

[mxinden]

Description

Make TCP_NODELAY the default. In other words, disable Nagle's algorithm.

Rational of Golang setting TCP_NODELAY as default: golang/go#57530

Motivation

Trading low latency over throughput, especially when sending small messages.

Already our defacto default, see various examples using it: https://github.com/search?q=repo%3Alibp2p%2Frust-libp2p%20nodelay&type=code

Current Implementation

TCP_NODELAY is not the default.

rust-libp2p/transports/tcp/src/lib.rs

Line 168 in a7d4cb3

nodelay: None,

Are you planning to do it yourself in a pull request ?

No

[romac]

I believe the linked PR did not actually address this issue, cf. #5469 (comment)