fix: allow plain to class to convert from Set to Set instead of from Set to Array

Description

Allow conversion from plain values containing Sets to Sets instead of Array.

[x] the pull request title describes what this PR does (not a vague title like Update index.md)
[x] the pull request targets the default branch of the repository (develop)
[x] the code follows the established code style of the repository
- npm run prettier:check passes
- npm run lint:check passes
[x] tests are added for the changes I made (if any source code was modified)
[ ] documentation added or updated
[x] I have run the project locally and verified that there are no errors

fixes #1723