Add support for torch.uint16 data type

[bhimrazy]

What does this PR do ?

Fixes #596 Introduce support for the torch.uint16 data type in the _TORCH_DTYPES_MAPPING.

test already seems to be present under test_tensor_serializer

[bhimrazy]

In the docs it does seem to say, limited support though:

cc: @robmarkcole @tchaton

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79%. Comparing base (32950dd) to head (ddf1ba7). Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #597   +/-   ##
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  Coverage    79%    79%           
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  Files        41     41           
  Lines      6136   6136           
===================================
  Hits       4836   4836           
  Misses     1300   1300           

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