Add Validation Annotation to Entities

[littlefieldnick]

Validation constraints and annotations need to be pulled over from the production code repository.

• [ ] Fieldworker
• [ ] Location
• [ ] Individual
• [ ] Social Group
• [ ] Relationship
• [ ] Residency
• [ ] Membership
• [ ] User
• [ ] Role

[calebblanchard]

Edited to include User and Role as entities that also require validation.