Use sequences instead of sets

[Baptouuuu]

Problem

Sets are used to describe a unique collection of properties, entities, etc... Even though this is the right structure conceptually, it adds lots of operations to make sure there are no duplicated objects. But the way the objects are created there can never be multiple instances of the same object inside a collection.

The result is that the time took to verify this unicity is wasted and impacts the overall performance of the ORM.

Solution

Replace Sets by Sequences.

Result

When running the benchmark script to list 100k aggregates this PR results in 19% time reduction:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f9275d5) 97.64% compared to head (d410a67) 97.62%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #13      +/-   ##
=============================================
- Coverage      97.64%   97.62%   -0.02%     
  Complexity       470      470              
=============================================
  Files             78       78              
  Lines           3182     3160      -22     
=============================================
- Hits            3107     3085      -22     
  Misses            75       75              

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