fix: concurrency crash on item attributes

[dudantas]

Description

This PR refactors the Attributes class by replacing std::shared_ptr<std::string> with std::string in the value variant. The previous implementation introduced unnecessary heap allocations and potential crashes due to incorrect shared pointer management. The refactor ensures safer and more efficient handling of string attributes.

Behaviour

Actual

If an attribute stored a std::shared_ptr<std::string>, there were cases where the reference was lost or improperly accessed, leading to crashes when trying to retrieve the string.

Expected

Attributes now store std::string directly, preventing dangling pointers and reducing overhead related to shared pointer allocation and dereferencing.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested

• Verified that all interactions using string attributes work correctly
• Ensured that string retrievals no longer result in crashes
• Tested attribute modifications and retrievals under various scenarios

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I checked the PR checks reports
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud