add support for actor runtime config, to make idle timeout scanning and gc of runtime actor in effective

add support for actor runtime config, to make idle timeout scanning and gc of runtime actor in effective

extend ActorConfig struct and assign to api.ActorRuntimeConfig,
to make idle timeout scanning and gc of runtime actor in effective.

Locate the ActorConfig struct and the api.ActorRuntimeConfig assignment in the Go SDK, then inspect how actor runtime settings are passed through. Add the runtime configuration needed for idle-timeout scanning and runtime-actor garbage collection, and verify that the resulting API configuration carries those settings.

Written by the indexing model from the issue text.