feat: Populate is_view property in AtlasProxy

[mgorsk1]

Summary of Changes

Distinguish between tables and table views based on tableType property of table in Atlas.

Tests

Extended mock and expected data.

Documentation

CheckList

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[codecov-commenter]

Codecov Report

Merging #155 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
+ Coverage   73.35%   73.38%   +0.02%     
==========================================
  Files          26       26              
  Lines        1265     1266       +1     
  Branches      136      136              
==========================================
+ Hits          928      929       +1     
  Misses        309      309              
  Partials       28       28              

Impacted Files	Coverage Δ
metadata_service/proxy/atlas_proxy.py	84.30% <100.00%> (+0.05%)	⬆️

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[feng-tao]

lgtm, but will let @verdan to confirm.

[feng-tao]

lgtm