ARROW-12743 [R] Add DESCRIPTION fields for dev dependencies
ARROW-12743 [R] Add DESCRIPTION fields for dev dependencies

This PR makes it easier to install additional dependencies by using the `Config/Needs/...` fields in DESCRIPTION.

```
remotes::install_deps(dependencies = c("Config/Needs/dev", "Config/Needs/website"))
```

Closes #11921 from dragosmg/ARROW-12743__additional_DESCRIPTION_fields

Lead-authored-by: Dragoș Moldovan-Grünfeld <9c9f9cb3247c58daa0f64b617331eb35608a8fa0@gmail.com>
Co-authored-by: Dragos Moldovan-Grünfeld <9c9f9cb3247c58daa0f64b617331eb35608a8fa0@gmail.com>
Signed-off-by: Nic Crane <b130ca97a5c118d9797a8d384d7c894a28655aef@gmail.com>

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