Executes a BRK with the provided input values
schemaValues object must match the schema of the BRK. You can use the Get BRK Schema endpoint to retrieve the schema.executionOptions object allows you to customize the execution behavior, such as the model to use and the sampling parameters.stream option is set to true, the response will be streamed as it is generated. This is useful for long-running executions.tokenUsage object provides information about the number of tokens used in the prompt, completion, and total. This can be useful for monitoring usage and costs.