perf: Rewriting convert_deflists for performance.

markdown/testdata/deflists/reference/pandoc/08-glossary.html

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+<dl>
+<dt>API</dt>
+<dd>
+An application programming interface, a set of rules that allow
+different software applications to communicate with each other.
+</dd>
+<dt>Framework</dt>
+<dd>
+A software library that provides a standardized structure for
+application development.
+</dd>
+<dt>Git</dt>
+<dd>
+A distributed version control system used to track changes in a project
+development process.
+</dd>
+<dt>IDE</dt>
+<dd>
+An integrated development environment, a software application that
+includes a code editor and various development tools.
+</dd>
+</dl>