Added programmatic description fields

[samshuster]

Summary of Changes

amundsen-io/amundsen#147

I added the inclusion of programmatic descriptions in the returned table metadata object.

Tests

I modified the proxy-neo4j tests to test for programmatic description.

Documentation

None added.

CheckList

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[jinhyukchang]

Cool! Left few comments. Let me know, @samshuster

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@5bb3b69). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #104   +/-   ##
=========================================
  Coverage          ?   70.58%           
=========================================
  Files             ?       21           
  Lines             ?     1030           
  Branches          ?      105           
=========================================
  Hits              ?      727           
  Misses            ?      277           
  Partials          ?       26

Impacted Files	Coverage Δ
metadata_service/api/table.py	100% <ø> (ø)
metadata_service/api/user.py	100% <ø> (ø)
metadata_service/proxy/atlas_proxy.py	84.69% <100%> (ø)
metadata_service/proxy/gremlin_proxy.py	44.77% <100%> (ø)
metadata_service/proxy/base_proxy.py	67.27% <100%> (ø)
metadata_service/proxy/neo4j_proxy.py	73.82% <100%> (ø)

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[samshuster]

ok i think i addressed all of your concerns @jinhyukchang! also revved minor version

[jinhyukchang]

Thanks for the update, @samshuster !