Add a person activity

curl --request POST \
  --url https://api.stardex.ai/v0/person-activities \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "linkedin_url": "<string>",
  "email": "jsmith@example.com",
  "full_name": "<string>",
  "person_id": "<string>",
  "activity_type": "secondary_note",
  "activity_content": "<string>"
}'

{
  "error": "<string>",
  "data": {
    "id": "<string>",
    "person_id": "<string>",
    "activity_type": "<string>"
  }
}