[ProductVariant] Added versioning for all product variant details

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Fixed tickets | #2025 
| License       | MIT

Please do let me know if I have to adjust anything to comply to your standards although I've made sure I comply. Love to be a contributor to this project although this is a minor fix.