Pre-submission checks

• I am not reporting a bug (crash, false positive/negative, etc). These must be filed via the bug report template.
• I have looked through the open issues for a duplicate request.

What's the problem this feature will solve?

it would be great to have zizmor add explanations like Rust / Clippy does. some lints aren't obvious what the issue or solution is.

Describe the solution you'd like

zizmor could add a --explain Z123 flag to explain more about the problem and how to address the lint.

Additional context

No response