feat(roxygen): Add roxygen tag for typed parameters/returns

I often find myself re-writting the same statements for typed parameters:

```r
#' @param x A `character` vector [blah blah blah]
```

Shoving type information into plain text is a bit messy and would benefit from having a more consistent shorthand. At least for now, just having something that might parse and produce something better formatted would be nice:

```r
#' @paramt x [`character`] blah blah blah
```

That produces

```tex
\arguments{
\item{x \code{character}}{
blah blah blah
}
}
```

Would help to give the type information a more dedicated space in the documentation and consistently format it.