[C++] Nicer PrettyPrint for date32

[asfimport]

Current:

In [3]: pa.array([date(2001, 1, 1), None, date(2001, 1, 2)])                                                                                                                                   
Out[3]: 
<pyarrow.lib.Date32Array object at 0x7f033ce9c458>
[
  11323,
  null,
  11324
]

Reporter: Wes McKinney / @wesm
Assignee: Ben Kietzman / @bkietz

PRs and other links:

• GitHub Pull Request #4268

_{Note: This issue was originally created as ARROW-4505. Please see the migration documentation for further details.}

[asfimport]

Joris Van den Bossche / @jorisvandenbossche:
And the same for TimestampArray:

In [55]: pa.array([pd.Timestamp("2012-01-01")])                                                                                                               
Out[55]: 
<pyarrow.lib.TimestampArray object at 0x7f27716a12c8>
[
  1325376000000000
]

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 4268
#4268