chore(build): enable minification for iife build

[SukkaW]

I was trying to reduce my bundle size by loading zxcvbn-ts from the CDN, and I noticed that the dist/zxcvbn-ts.js files are not minified.

The PR updates the rollup configuration by adding dist/zxcvbn-ts.min.js and zxcvbn-ts.min.js.map, minified by @rollup/plugin-terser.

[SukkaW]

Confirmed the minified build is available on the jsDelivr:

• @zxcvbn-ts/core
  • The newly added minified version: https://cdn.jsdelivr.net/npm/@zxcvbn-ts/[email protected]/dist/zxcvbn-ts.min.js
  • The non-minified version (under the old dist/zxcvbn-ts.js, retained for the backward compatibility): https://cdn.jsdelivr.net/npm/@zxcvbn-ts/[email protected]/dist/zxcvbn-ts.js
• @zxcvbn-ts/language-common
  • https://cdn.jsdelivr.net/npm/@zxcvbn-ts/[email protected]/dist/zxcvbn-ts.min.js
  • https://cdn.jsdelivr.net/npm/@zxcvbn-ts/[email protected]/dist/zxcvbn-ts.js
• @zxcvbn-ts/language-en
  • https://cdn.jsdelivr.net/npm/@zxcvbn-ts/[email protected]/dist/zxcvbn-ts.min.js
  • https://cdn.jsdelivr.net/npm/@zxcvbn-ts/[email protected]/dist/zxcvbn-ts.js