[folding] fold all but comments

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) { ... } ```