Fix safety data involve query issues

[ziv17]

Closes issue #2774

1. Stream query results
2. Fix joins with type tables.

This PR includes also #2773

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 54.30%. Comparing base (07a333b) to head (a45c46f).
Report is 21 commits behind head on dev.

Files with missing lines	Patch %	Lines
anyway/flask_app.py	0.00%	9 Missing ⚠️
anyway/views/safety_data/city_query.py	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2775      +/-   ##
==========================================
+ Coverage   52.57%   54.30%   +1.73%     
==========================================
  Files         122      126       +4     
  Lines       10232    10658     +426     
==========================================
+ Hits         5379     5788     +409     
- Misses       4853     4870      +17     

Flag	Coverage Δ
unittests	54.30% <0.00%> (+1.73%)	⬆️

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