Add support for recording `tc` stats

[mmynk]

The PR is broken into modular commits, so it might be easier to review the PR commit-by-commit.

Commit: Add sub-module for reading tc stats

• Uses netlink-tc library which reads tc qdisc and class via rtnetlink

Commit: Add model to represent tc stats

• Defined a TcModel struct to represent the diff between two Tc stats sample

Commit: Add dump command and implement Dumper for rendering TcModel

• Add dump and render configs for tc fields and model

Commit: Fix and add more UTs