feat: Added Backend support for Internships. tested: adding, reading. Not final

package.json

src/app.module.ts

src/internships/dao/internships.dao.ts

src/internships/dto/create-internship.dto.ts

src/internships/dto/internship.dto.ts

src/internships/dto/nested-create/address.dto.ts

src/internships/dto/nested-create/affectation.dto.ts

src/internships/dto/nested-create/company.dto.ts

src/internships/dto/nested-create/compensation.dto.ts

src/internships/dto/nested-create/information.dto.ts

src/internships/dto/nested-create/student.dto.ts

src/internships/dto/nested-create/tracking.dto.ts

src/internships/entities/internship.entity.ts

src/internships/entities/nested-entities/address.entity.ts

...nternships/entities/nested-entities/affectation.entity.ts

src/internships/entities/nested-entities/company.entity.ts

...ternships/entities/nested-entities/compensation.entity.ts

...nternships/entities/nested-entities/information.entity.ts

src/internships/entities/nested-entities/student.entity.ts

src/internships/entities/nested-entities/tracking.entity.ts