ARROW-7662: [R] Support creating ListArray from R list

Closes #6275 from MichaelChirico/r-parquet-array and squashes the following commits:

2914c50 <Neal Richardson> Merge branch 'master' into r-parquet-array
a8f26a1 <François Saint-Jacques> Address comments
fc75d86 <François Saint-Jacques> Implement R's vector to arrow::Array conversion
a3a406b <Michael Chirico> half step forward
93a0b90 <Michael Chirico> progress (?) by mimicking MakeStringArray
6d172df <Michael Chirico> more intermediate
45663c2 <Michael Chirico> initial attempt at CheckCompatibleList
cacd799 <Michael Chirico> skeleton of way forward
9cdd2fe <Michael Chirico> linting
62cc75c <Michael Chirico> linting again
331fa3d <Michael Chirico> linting
761d083 <Michael Chirico> Merge branch 'master' into r-parquet-array
7e1d331 <Michael Chirico> Merge branch 'r-parquet-array' of github.com:MichaelChirico/arrow into r-parquet-array
1de3dc4 <Michael Chirico> fix typos
35ae9c8 <Michael Chirico> Update r/NEWS.md
c234788 <Michael Chirico> initial foray into adding list column support for parquet writing

Lead-authored-by: Michael Chirico <michaelchirico4@gmail.com>
Co-authored-by: Michael Chirico <michael.chirico@grabtaxi.com>
Co-authored-by: François Saint-Jacques <fsaintjacques@gmail.com>
Co-authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>

r/NEWS.md

@@ -23,6 +23,7 @@
 * `write_feather`, `write_arrow` and `write_parquet` now return their input
 similar to `write_*` functions from `readr` (#6387, @boshek)
 * Dataset filtering is now correctly supported for all Arrow date/time/timestamp column types.
+* Can now infer the type of an R `list` and create a ListArray when all list elements are the same type (#6275, @michaelchirico)
 
 # arrow 0.16.0