public ExcelWriterBuilder password(String password) {
        writeWorkbook.setPassword(password);
        return this;
    }
Whether the encryption.
<p>
WARRING:Encryption is when the entire file is read into memory, so it is very memory intensive.

@param password
@return
fastexcel-core/src/main/java/cn/idev/excel/write/builder/ExcelWriterBuilder.java