Add __getitem__, __setitem__ and get methods

[RajaPiseD]

Description

Add getitem, setitem and get methods in Object class

Checklist

• I have tested these changes locally.
• I have added unit tests (if appropriate).
• I have added necessary documentation or updated existing documentation.
• I have linked the issue(s) addressed by this PR if any.

[FedericoNegri]

Left a couple of comments. Please merge main into this branch and make sure checks pass.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.72%. Comparing base (cbfce9c) to head (5ddc20b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #390      +/-   ##
==========================================
+ Coverage   93.71%   93.72%   +0.01%     
==========================================
  Files          62       62              
  Lines        2402     2408       +6     
==========================================
+ Hits         2251     2257       +6     
  Misses        151      151              

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