feat: add modify password routes

TODO.md

client/src/binding/ChangePasswordPayload.ts

client/src/components/NewPasswordForm.tsx

client/src/components/ParticipantForm.tsx

client/src/components/ProtectedRoute.tsx

client/src/index.tsx

client/src/request/fetch_wrapper.ts

client/src/request/routes.ts

client/src/routes/ChangePassword.tsx

server/src/model/participant.rs

server/src/routes/change_password.rs

server/src/routes/delete_participant.rs

server/src/routes/mod.rs