[C++] Decide if typed Tensor subclasses are worthwhile

[asfimport]

See discussion in #560. Since this is primarily a data container (only arrow::Tensor being used in Python, for example), and the subclasses are quite a bit of work to wrap, it's unclear whether they are of high value to maintain.

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

Related issues:

• Arrow 0.3 release (blocks)

_{Note: This issue was originally created as ARROW-860. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
PR: #571

[asfimport]

Uwe Korn / @xhochy:
Issue resolved by pull request 571
#571