@Override
        public String toString() {
            return new StringJoiner(", ", StatementCacheKey.class.getSimpleName() + "[", "]")
                    .add("templateEngine=" + templateEngine)
                    .add("template='" + template + "'")
                    .toString();
        }
Returns cache statistics for the internal template cache. This returns a cache specific object,
so the user needs to know what caching library is in use.

@param <T> the type of the cache statistics object
core/src/main/java/org/jdbi/v3/core/statement/SqlStatements.java