feat : manage structures page

src/app/models/structure.model.ts

src/app/profile/profile-routing.module.ts

src/app/profile/profile.component.html

src/app/profile/profile.component.ts

src/app/profile/profile.module.ts

...rs-management/structure-members-management.component.html

...tructures-management/structures-management.component.html

...tructures-management/structures-management.component.scss

...ctures-management/structures-management.component.spec.ts

.../structures-management/structures-management.component.ts

src/app/services/structure.service.ts

...hared/components/custom-modal/custom-modal.component.html

...hared/components/custom-modal/custom-modal.component.scss

...ed/components/custom-modal/custom-modal.component.spec.ts

.../shared/components/custom-modal/custom-modal.component.ts

src/app/shared/components/index.ts