Upsert the JSON Schema for a config page

curl --request PUT \
  --url https://api.us.poly.ai/v1/agents/{agentId}/real-time-configs/{clientEnv}/schema \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "schema": {}
}'

{
  "clientEnv": "<string>",
  "variables": {},
  "schema": {},
  "lastUpdated": "<string>"
}