[Feature Requests] List enabled features by binary -v command

[muink]

List the enabled features by binary -v command as follows:

root@root:~# einat -v
Version: v0.1.5
Tags: ipv6,aya,libbpf,bindgen,static

This can alert users to prevent them from using unenabled features.

[EHfive]

I had thought about this, will work on this once I got time, and feel free to send a PR if anyone want to make a tiny contribution to this project.

The crate to use https://crates.io/crates/build-info (this crate is unpolished and could breaks offline build)

[EHfive]

einat -v now prints this:

version: 0.1.5 features: aya,libbpf build_features: pkg-config

It can be parsed by splitting keys and values by whitespace and splitting feature flags by comma.