Fix for Concurrent Map Access in HashSet & LinkedHashSet

[lunuan]

Improved HashSet for concurrent map operations by integrating sync.RWMutex for thread-safe reads and writes. This change prevents potential data races and ensures consistent performance in multi-threaded environments.

Changes include:

• Added sync.RWMutex for safe access.
• Protected all read and write methods with appropriate locks.
• Updated unit tests to cover concurrent scenarios.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
26.3% Duplication on New Code

See analysis details on SonarCloud