curl --request GET \
  --url https://api.glialhealth.com/v1/extraction-schemas/{schema_id}

{
  "created_at": "2023-11-07T05:31:56Z",
  "document_type": "<string>",
  "fields": [
    {
      "key": "<string>",
      "hint": "<string>",
      "pattern": "<string>",
      "required": false,
      "type": "string"
    }
  ],
  "id": "<string>",
  "name": "<string>",
  "tables": [
    {
      "columns": [
        "<string>"
      ],
      "key": "<string>"
    }
  ],
  "object": "extraction_schema"
}