referred to bcc, adding dump function and parse of printk content in utils

[hsqStephenZhang]

i have been used both python's bcc and rust-bcc for a while, and founded rust-bcc lack some useful utils in python's version , but i really love rust and bpf, i wanna do more for rust-bcc

[brayniac]

Can you run rustfmt on this and push again? The CI jobs have been updated and now cover bcc up to 0.23.0 - so we should see those run once you push again.

I'd appreciate if the PR summary was updated to summarize what you're adding/changing in this PR and why. It'll provide helpful context for reviewers.

[hsqStephenZhang]

bpf_trace_printk is the most useful way to display informations in eBPF. In bcc, there is a useful but simple method called trace_fields, it will parse the /sys/kernel/debug/tracing/trace_pipe with the standard format, so we'd better add some utils for better ergonomic experience.

[hsqStephenZhang]

also, the dump feature is powered by bcc, it's useful when you wanna see how code works.