Add non-standard ealb (east asian line break) option

See pandoc: https://pandoc.org/MANUAL.html#extension-east_asian_line_breaks

org/testdata/east_asian_line_breaks.html

@@ -0,0 +1,8 @@
+<p>
+Line breaks between multi-byte characters are omitted when the <code class="verbatim">ealb</code> option is set:</p>
+<ul>
+<li>中午吃啥</li>
+<li>something else
+中午吃啥
+something else</li>
+</ul>