feat(personalOffers): create personal offers endpoints

src/app.module.ts

src/auth/auth.service.spec.ts

src/personal-offers/dto/create-personal-offer.dto.ts

src/personal-offers/dto/personal-offer.dto.ts

src/personal-offers/personal-offers.controller.spec.ts

src/personal-offers/personal-offers.controller.ts

src/personal-offers/personal-offers.module.ts

src/personal-offers/personal-offers.service.spec.ts

src/personal-offers/personal-offers.service.ts

src/personal-offers/schemas/personal-offer.schema.ts

src/shared/schemas/week.schema.ts

src/structures/dto/structure.dto.ts

src/structures/schemas/structure.schema.ts

src/structures/services/structure.service.spec.ts

src/structures/services/structures.service.ts

src/structures/structures.controller.spec.ts

src/users/dto/create-user.dto.ts

src/users/guards/isPersonalOfferOwner.guard.spec.ts

src/users/guards/isPersonalOfferOwner.guard.ts

src/users/guards/isStructureOwner.guard.spec.ts