[Feature Request] Add support for code block inside blockquote

[rgaiacs]

knitr supports inline code inside blockquote. For example

```{r}
x <- 1
```

Test `r x`

> Test `r x`

is converted to

<pre class="r"><code>x &lt;- 1</code></pre>
<p>Test 1</p>
<blockquote>
<p>Test 1</p>
</blockquote>

Will be great if code block inside blockquote is also allowed. For example

> ```{r}
> x <- 1
> ```

Test `r x`

which right now gives

Error in eval(expr, envir, enclos) : object 'x' not found
Calls: <Anonymous> ... in_dir -> inline_exec -> withVisible -> eval -> eval

[yihui]

Done. Thanks!

[github-actions]

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