Add variables for LaTeX: CJKsansfont, CJKmonofont, and their options

Add variables for LaTeX: CJKsansfont, CJKmonofont, and their options

[Yasu Atsu]

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Hi, I suggest updating L138-L143 of default.latex to give more supports on 
CJK in LaTeX 
such as sans and mono fonts in addition to the main one.
https://github.com/jgm/pandoc/blob/8b00bc6029b9285f872ae517a8d4538c66070fa9/data/templates/default.latex#L138-L142

My implementation requires assigning CJKmainfont in order to use 
CJKsansfont and CJKmonofont because

- It is strange to set the non-main fonts without setting the main one.
- Checking $if(...)$ repeatedly at the top levels for each CJK require 
`\usepackage{xeCJK}` repeatedly.

```
$if(CJKmainfont)$
  \ifxetex
    \usepackage{xeCJK}
    
\setCJKmainfont[$for(CJKoptions)$$CJKoptions$$sep$,$endfor$]{$CJKmainfont$}
    $if(CJKsansfont)$
      
\setCJKsansfont[$for(CJKsansoptions)$$CJKsansoptions$$sep$,$endfor$]{$CJKsansfont$}
    $endif$
    $if(CJKmonofont)$
      
\setCJKmonofont[$for(CJKmonooptions)$$CJKmonooptions$$sep$,$endfor$]{$CJKmonofont$}
    $endif$
  \fi
$endif$
```

LuaTex can also be supported by using \setsansjfont and \setmonojfont.

Any suggestions?

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