[C++] Type casting function kernel suite

[asfimport]

Tracking issue to collect related casting issues

Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm

Related issues:

• [C++] Add casting option to set unsafe casts to null rather than some garbage value (contains)
• [C++] Implement safe casts for primitive types (contains)
• [C++] Expose type casts as generic callable object that can write into pre-allocated memory (contains)
• [C++] Implement casts between date32 and date64 (contains)
• [C++] Implement casts between time32 and time64 (contains)
• [C++] Implement (safe and unsafe) casts between timestamps and times of different units (contains)
• [C++] Implement casts from List to List, where a cast function is defined from any A to B (contains)
• [C++] Add casting implementations from strings to numbers or boolean (contains)
• [C++] Function for casting from days since UNIX epoch to int64 date (incorporates)
• [Python] pyarrow.Array.from_pandas should take a type parameter (incorporates)
• C++: Add cast from Dictionary to plain arrays (incorporates)

_{Note: This issue was originally created as ARROW-1492. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
We still have more to do, but we don't need an umbrella JIRA to track further casting functions