[ISSUE-166][DEPENDENCY_UPDATE] Compatibility with Qt6

[sevketcaba]

Change description:

- Migrated to Qt6 (with Qt5 backward compatibility)

Verification criteria:

- Verified manually on Ubuntu (build only)

[ISSUE 166] [DEPENDENCY_UPDATE] Compatibility with Qt6

1. [x] Have you followed the guidelines in our Contributing document?
2. [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
3. [ ] Have you built the project, and performed manual testing of your functionality for all supported platforms - Linux and Windows?
4. [x] Is your change backward-compatible with the previous version of the plugin?

Change description:

• Migrated to Qt6 (with Qt5 backward compatibility)

  Verification criteria:

• Verified manually on Ubuntu (build only)
• Built with Qt 5.15.2
• Built with Qt 6.5.0