[CLIENT-2417] Replace partitions status dictionary with aerospike.PartitionsStatus class

[juliannguyen4]

…n python

• All the test cases in the test file test_scan_get_partitions_status.py are still in test_query_get_partitions_status.py, I believe
• Valgrind memory leaks for get_partitions_status are gone

TODO: make PartitionsStatus class fully backwards compatible with dictionary class

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (ca2f4be) to head (38d99d1).
Report is 7 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #683       +/-   ##
==========================================
- Coverage   80.89%   0.00%   -80.90%     
==========================================
  Files         102      45       -57     
  Lines       15186    7395     -7791     
==========================================
- Hits        12285       0    -12285     
- Misses       2901    7395     +4494     

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