chore: clean up host CLI

[clabby]

Overview

Cleans up the host CLI validation by using the native features of the clap::arg proc macro over a custom validation function. Also adjusts some of the flag docs to be a bit more helpful.

and, colors, because it's kind of cool 🎨

[clabby]

• chore: clean up host CLI #536 👈
• fix(preimage): Improve error differentiation in preimage servers #535
• main

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.2%. Comparing base (22a3c62) to head (0886c8f).
Report is 1 commits behind head on cl/preimage-error.

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[refcell]

LGTM - though Q on the change in default tracing levels.