Initialize All Tables

[blueandgold]

Ensure all the tables are created, to support client usages & joins, which expect the tables to exist even if empty.

[codecov]

Codecov Report

Merging #536 into dev will decrease coverage by 0.03%.
The diff coverage is 28.57%.

@@            Coverage Diff            @@
##             dev     #536      +/-   ##
=========================================
- Coverage   81.2%   81.17%   -0.04%     
=========================================
  Files        156      156              
  Lines       7518     7521       +3     
=========================================
  Hits        6105     6105              
- Misses      1413     1416       +3

Impacted Files	Coverage Δ
...oogle/cloud/security/inventory/inventory_loader.py	33.33% <0%> (-0.75%)	⬇️
...cloud/security/common/data_access/violation_dao.py	83.72% <100%> (ø)	⬆️
google/cloud/security/common/data_access/dao.py	61.29% <33.33%> (ø)	⬆️

[mirons-google]

Approved, but it would be nice to include test coverage for this and anything else here you're willing to do.

[blueandgold]

Let me punt on the testing here as this whole piece might be changing soon. Thanks!