Create a new extraction schema version for an agent

curl --request POST \
  --url https://api-sandbox.featherhq.com/v1/agents/{agent_id}/extraction-schemas \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "name": "<string>",
  "schema_json": {},
  "description": "<string>"
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "organization_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "agent_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "version": 123,
  "name": "<string>",
  "description": "<string>",
  "schema_json": {},
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}