Replacing backend Athena calls

[isichei]

• Package now uses boto3 to make athena calls instead of pyathenajdbc.
• Package no longer requires pyathenajdbc and therefore does not require Java install.
• Should make docker builds which need to use refresh_paritions or refresh_all_table_partitions less complex.

[codecov-io]

Codecov Report

Merging #67 into master will increase coverage by 1.23%. The diff coverage is 90.76%.

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   74.32%   75.55%   +1.23%     
==========================================
  Files           4        4              
  Lines         814      855      +41     
==========================================
+ Hits          605      646      +41     
  Misses        209      209

Impacted Files	Coverage Δ
tests/test_tests.py	95.7% <100%> (+0.23%)	:arrow_up:
etl_manager/utils.py	79.41% <100%> (+3.54%)	:arrow_up:
etl_manager/etl.py	57.39% <33.33%> (-0.58%)	:arrow_down:
etl_manager/meta.py	73.14% <94.28%> (+2.27%)	:arrow_up:

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