Increase resilience to generating large workbooks

Port the same feature from PR [#2320](exceljs/exceljs#2320) by @hfhchan-plb from [ExcelJS](https://github.com/exceljs/exceljs/)

Author: gltjk

lib/utils/xml-stream.js

@@ -7,24 +7,19 @@ const OPEN_ANGLE = '<';
 const CLOSE_ANGLE = '>';
 const OPEN_ANGLE_SLASH = '</';
 const CLOSE_SLASH_ANGLE = '/>';
-const EQUALS_QUOTE = '="';
-const QUOTE = '"';
-const SPACE = ' ';
 
 function pushAttribute(xml, name, value) {
-  xml.push(SPACE);
-  xml.push(name);
-  xml.push(EQUALS_QUOTE);
-  xml.push(utils.xmlEncode(value.toString()));
-  xml.push(QUOTE);
+  xml.push(` ${name}="${utils.xmlEncode(value.toString())}"`);
 }
 function pushAttributes(xml, attributes) {
   if (attributes) {
+    const tmp = [];
     _.each(attributes, (value, name) => {
       if (value !== undefined) {
-        pushAttribute(xml, name, value);
+        pushAttribute(tmp, name, value);
       }
     });
+    xml.push(tmp.join(""));
   }
 }