Improved error handling in Inngest SDKs

Inngest has improved error handling in its SDKs by allowing users to handle failed steps with standard language primitives. This enables more flexibility in error handling while maintaining the automatic retries feature of Inngest functions. Users can now perform rollbacks, create workflows based on errors, and handle rejected inputs without marking the function as "failed." The improved error handling is available in TypeScript (v3.12.0) and Go (v0.6.0) SDKs, with plans to roll it out to Python soon.