* Add embedded runtime for evaluating code in the Livebook VM
* Update lib/livebook_web/live/session_live/embedded_live.ex
Co-authored-by: José Valim <jose.valim@dashbit.co>
* Use standard error proxy globally in the Livebook node
* Add configuration env variable for setting the default runtime
* Increase evaluation response assertion timeouts
Co-authored-by: José Valim <jose.valim@dashbit.co>
