@SuppressWarnings("unchecked")
    public T setCharset(String charset) {
        this.charset = charset;
        return (T) this;
    }
The builder for the deserializers for mixed text InLongMsg formats.

@param <T> The type of the builder.
inlong-sort/sort-formats/format-rowdata/format-inlongmsg-rowdata-base/src/main/java/org/apache/inlong/sort/formats/inlongmsg/InLongMsgTextMixedFormatDeserializerBuilder.java