Org reader: More flexible LaTeX environments

Looking at the definition of `org-element-latex-environment-parser`, one
sees that Org allows arbitrary arguments to LaTeX environments. In fact,
it parses every char just after `\begin{xxx}` until `\end{xxx}` as
content for the environment, so all the following examples are valid
environments:

```org
\begin{equation} e = mc^2 \end{equations}
```
```org
\begin{tikzcd}[ampersand replacement=\&]
	A \& B \\
	C \& D
	\arrow[from=1-1, to=1-2]
	\arrow["f", from=2-1, to=2-2]
\end{tikzcd}
```

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