default @Nullable String getSuffix() {
        return querySuffix().result();
    }
Gets the suffix.

<p>This method uses the rules defined by the {@link #getSuffixStackDefinition() suffix stack}
to produce a {@link String} output.</p>

<p>Assuming the default configuration is used, this will usually be the value of the
holder's highest priority suffix node.</p>

<p>If the resultant suffix stack contained no elements, {@code null} is returned.</p>

@return a suffix string, or null
api/src/main/java/net/luckperms/api/cacheddata/CachedMetaData.java