Add __getitem__, __setitem__ and get methods

[RajaPiseD]

Description

Add getitem, setitem and get methods in Object class

Checklist

• [X] I have tested these changes locally.
• [X] 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.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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