[C++] Remove arrow::Column class from C++ library #22307
Description
Opening JIRA per ongoing discussion on mailing list.
This class unfortunately touches a lot of places, so I'm going to start by removing it from the C++ and Python libraries to assist with discussion about its fate.
Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm
PRs and other links:
Note: This issue was originally created as ARROW-5893. Please see the migration documentation for further details.