[CLIENT-2760] Move raise exception code to aerospike module

[juliannguyen4]

Extra changes:

• Create a dummy package called aerospike. Rename the aerospike extension module to _aerospike and place under this dummy package

running importlib.import_module while an AerospikeError is set causes it to fail

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 74.41860% with 44 lines in your changes missing coverage. Please review.

Project coverage is 80.19%. Comparing base (ca2f4be) to head (8869287). Report is 7 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/main/aerospike.c	75.72%	25 Missing :warning:
src/main/client/info.c	33.33%	6 Missing :warning:
src/main/exception.c	61.53%	5 Missing :warning:
src/main/query/where.c	0.00%	3 Missing :warning:
src/main/client/sec_index.c	50.00%	2 Missing :warning:
src/main/scan/apply.c	0.00%	2 Missing :warning:
src/main/client/batch_get_ops.c	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #698      +/-   ##
==========================================
- Coverage   80.89%   80.19%   -0.71%     
==========================================
  Files         102      102              
  Lines       15186    15019     -167     
==========================================
- Hits        12285    12044     -241     
- Misses       2901     2975      +74     

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