feat: Add scalar package

[erezrokah]

Reference in https://github.com/cloudquery/plugin-sdk/tree/main/scalar

### Interfaces
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/7
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/26
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/34
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/39
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/58
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/62
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/53
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/63
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/61
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/64
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/60
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/44
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/54
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/52
- [ ] https://github.com/cloudquery/plugin-sdk-java/issues/65

[erezrokah]

Closing as done for the initial version