feat: Column badges in Atlas Proxy

[mgorsk1]

Signed-off-by: mgorsk1 gorskimariusz13@gmail.com

Summary of Changes

This PR introduces support for surfacing column badges in Atlas Proxy.

Tests

TBD

Documentation

n/a

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[codecov-io]

Codecov Report

Merging #263 (79fa0e2) into master (2752492) will increase coverage by 3.19%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #263      +/-   ##
==========================================
+ Coverage   74.10%   77.29%   +3.19%     
==========================================
  Files          25       27       +2     
  Lines        1255     1370     +115     
  Branches      136      164      +28     
==========================================
+ Hits          930     1059     +129     
+ Misses        297      262      -35     
- Partials       28       49      +21     

Impacted Files	Coverage Δ
metadata_service/api/__init__.py	82.60% <ø> (ø)
metadata_service/api/column.py	100.00% <ø> (ø)
metadata_service/api/popular_tables.py	100.00% <ø> (ø)
metadata_service/api/system.py	66.66% <ø> (ø)
metadata_service/api/user.py	100.00% <ø> (ø)
metadata_service/proxy/statsd_utilities.py	81.25% <ø> (ø)
metadata_service/util.py	100.00% <ø> (ø)
metadata_service/proxy/shared.py	28.57% <28.57%> (ø)
metadata_service/api/badge.py	61.29% <61.29%> (ø)
metadata_service/proxy/neo4j_proxy.py	71.55% <61.53%> (-3.45%)	⬇️
... and 16 more

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[mgorsk1]

cc @verdan

[verdan]

LGTM!
Would be nice to add/update the test cases.