[Python] Write and read tensors (with zero copy) into shared memory

[asfimport]

See example implementation in https://github.com/ray-project/ray/blob/master/src/numbuf/python/src/pynumbuf/adapters/numpy.cc

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

Related issues:

• Arrow 0.3 release (blocks)
• [Format] Add a TensorMessage type (depends upon)

_{Note: This issue was originally created as ARROW-657. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
The original issue scope is addressed by the patch for ARROW-718. I'm renaming this to account for IPC read/write from Python

[asfimport]

Wes McKinney / @wesm:
PR: #483

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 483
#483