feat: add email forwarding

frontend/src/analyst/Emails/index.tsx

frontend/src/components/ContentArea/index.tsx

frontend/src/email/EmailForm/InstructorEmailForm.tsx

frontend/src/email/EmailForm/TraineeEmailForm.tsx

frontend/src/email/EmailForm/modules/HeaderArea.tsx

frontend/src/email/EmailForm/typing.ts

frontend/src/email/EmailForm/useFormState.ts

frontend/src/email/EmailFormOverlay/index.tsx

frontend/src/email/TeamEmails/EmailCard.tsx

frontend/src/email/TeamEmails/InstructorTeamEmails.tsx

frontend/src/email/TeamEmails/TraineeTeamEmails.tsx

frontend/src/email/TeamEmails/index.tsx