feat: add a consistent table formatter for tabular output

[angeloashmore]

Resolves: #113

Description

Add a formatTable utility to src/lib/string.ts that computes column widths and pads cells with consistent spacing. Refactor all commands with tabular output to use it, replacing ad-hoc padEnd() logic and unaligned double-space concatenation.

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

How to QA ¹

• Run prismic --help and prismic <command> --help to verify aligned columns in help text
• Run list commands (locale list, repo list, token list, preview list, webhook list, type list, slice list, docs list) to verify aligned columns
• Run view commands (type view, slice view) to verify aligned field tables

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Note

Low Risk
Low risk formatting-only change: replaces ad-hoc string concatenation/padding with a shared formatTable helper, which could slightly alter CLI text output and snapshot-like tests but not behavior or data handling.

Overview
Adds a new formatTable() utility in src/lib/string.ts and switches CLI help + multiple list/view commands to use it for consistently aligned, columnar output (including optional headers).

Updates command help rendering in src/lib/command.ts and refactors tabular outputs in commands like docs list, repo/locale/preview/token/webhook/type/slice list, and type/slice view; associated tests were loosened to match whitespace-aligned table output rather than exact strings.

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