Implement tutor functionality

src/lib/components/AdminLayout.svelte

src/lib/components/MailInput.svelte

src/lib/csv.ts

src/lib/i18n/de.ts

src/lib/i18n/en.ts

src/lib/i18n/i18n.ts

src/lib/perms.ts

src/lib/server/database/entities/StudyProgram.entity.ts

src/lib/server/database/entities/Tutor.entity.ts

src/lib/server/database/entities/TutorStudyProgram.entity.ts

src/lib/server/database/migrations/0_init.sql

src/lib/server/paths.ts

src/routes/(non-admin)/tutor/+page.server.ts

src/routes/(non-admin)/tutor/+page.svelte

src/routes/(non-admin)/tutor/register/+page.server.ts

src/routes/(non-admin)/tutor/register/+page.svelte

src/routes/admin/studyprogram/+page.server.ts

src/routes/admin/studyprogram/+page.svelte

src/routes/admin/tutor/+page.server.ts

src/routes/admin/tutor/+page.svelte