[C++] Consolidate array container and builder code, remove arrow/types #15336
Description
In the interest of simplifying the public API, I'd like to put all of the Array subclass definitions in arrow/array.h and all the Builder definitions in arrow/builder.h
Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm
Note: This issue was originally created as ARROW-418. Please see the migration documentation for further details.