ARROW-3399: [Python] Implementing numpy matrix serialization#4096

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rok wants to merge 4 commits intoapache:masterfrom

Commits on Apr 11, 2019

Adding numpy matrix serialization support and test.
rok
committed
Removing copy from np.matrix deserialization. Adding tests for various datatypes at np.matrix deserialization.
rok
committed

Commits on Apr 12, 2019

Adding cutom type to np.matrix serialization tests.
rok
committed

Commits on Apr 15, 2019

Moving np.matrix serialization tests from test_plasma to test_serialization.
rok
committed