feat: add stylelint v15

[ricardogobbosouza]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

Add support stylelint v15

Resolve #322

Breaking Changes

No

Additional Info

• The stylelint types were grouped https://github.com/webpack-contrib/stylelint-webpack-plugin/pull/323/files#diff-b59200fab82040a2e5fcde2ed3e7f466efa9fa8a40c9fef40236d3e2de37b344R13-R18
• Stylelint v15 exports are different:

// https://github.com/stylelint/stylelint/blob/15.0.0/lib/index.js#L16
/** @typedef {import('stylelint').default} Stylelint */

In previous versions

// https://github.com/stylelint/stylelint/blob/14.16.1/lib/index.js#L16
/** @typedef {import('stylelint').PublicApi} Stylelint */

For this reason, manually defined

/** @typedef {{lint: (options: LinterOptions) => Promise<LinterResult>, formatters: { [k: string]: Formatter }}} Stylelint */

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (6f80f5e) compared to base (d9a850e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #323   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          256       256           
  Branches        50        50           
=========================================
  Hits           256       256           

Impacted Files	Coverage Δ
src/getStylelint.js	100.00% <ø> (ø)
src/index.js	100.00% <ø> (ø)
src/linter.js	100.00% <ø> (ø)
src/options.js	100.00% <ø> (ø)
src/worker.js	100.00% <ø> (ø)

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