Add option to disable markdown highlighting in JSDoc comments

[futagoza]

Would it be possible to add an option to disable the markdown highlighting in JSDoc comments?

{
    // can be used to explicitly opt into disabling the default behavour
    "jsdoc.disableMarkdownHighlighting": false,

    // explicitly describes the default behavour, disabling it on `false`
    "jsdoc.highlightMarkdown": true,
}

As for my motive (or use case): it's distracting when using JSDoc types in plain JavaScript 😢

[mjbvz]

Depends on #53885

[mjbvz]

This functionality now ships as an extension: https://marketplace.visualstudio.com/items?itemName=bierner.jsdoc-markdown-highlighting