Used package install command for list of required ESLint-related packages

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing issue: fixes Recommend npm or yarn installation commands for packages #11
• That issue was marked as status: accepting prs

Overview

Instead of displaying a line-by-line list of missing plugins, this creates a copy&paste-able command for the detected package manager (npm, pnpm, or Yarn) by lock file, or npm by default.

...

❓ 1 rule does not yet have an ESLint equivalent ❓
  See generated log file; defaulting to eslint-plugin-tslint for it.

⚡ 6 packages are required for running with ESLint. ⚡
  npm install @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint eslint-plugin-import eslint-plugin-jsdoc eslint-plugin-prefer-arrow --save-dev

✅ All is well! ✅

Switches all converters to report plugins in the eslint-plugin- syntax, since they need to be installable by the package manager. I have a vague recollection of commenting on this / wanting it to be standardized recently but can't remember where. 🤷

[JoshuaKGoldberg]

These came up during development. Annoying.