[folding] fold all but comments

[kraftwer1]

Now that we have syntax aware folding, I wonder if we could prevent comments from being folded (configurable, if wanted).

This would enable to get an overview of a file very quickly.

Now

/** ...
reload() { ...
}

Desired

/**
 * This important comment documents the signature of `reload()`
 * @param force Enforce reloading
 */
reload(force: boolean) { ...
}