Create party

curl --request POST \
  --url https://api.case.dev/matters/v1/parties \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "type": "person",
  "email": "<string>",
  "phone": "<string>",
  "addresses": [
    {}
  ],
  "metadata": {},
  "custom_fields": {},
  "notes": "<string>"
}
'