static QueryParams fromQueryString(@Nullable String queryString) {
        return fromQueryString(queryString, 1024);
    }
Decodes the specified query string into a {@link QueryParams}, as defined in
<a href="https://www.w3.org/TR/2014/REC-html5-20141028/forms.html#url-encoded-form-data">4.10.22.6,
HTML5 W3C Recommendation</a>.

@param queryString the query string without leading question mark ({@code '?'}).
@return the decoded {@link QueryParams}. An empty {@link QueryParams} is returned
        if {@code queryString} is {@code null}.
core/src/main/java/com/linecorp/armeria/common/QueryParams.java