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Romain FrancoisKorn, Uwe
97da1aa6922
Romain Francois authored and Korn, Uwe committed 037f6d94179
ARROW-3339: [R] Support for character vectors

More tests, but here is the gist:

```r
> a <- array(c("itsy", "bitsy", "spider"))
> a
arrow::Array <0x11447cbc0>
[
  "itsy",
  "bitsy",
  "spider"
]
> a$as_vector()
[1] "itsy"   "bitsy"  "spider"
```

Author: Romain Francois <romain@purrple.cat>

Closes #2654 from romainfrancois/feature/3339-character-vectors and squashes the following commits:

f24322f8 <Romain Francois> Tests for character vector <-> StringArray
6a6b89d6 <Romain Francois> StringArray -> character vector
e0579ecb <Romain Francois> character vector -> StringArray
68741deb <Romain Francois> apply feedback from https://github.com/apache/arrow/pull/2652#pullrequestreview-159756904