[WORKFLOW SDK BUG] `custom_status` should allow `Any` type

We should change the type for `workflow_context.set_custom_status` from `str` to `Any` to match [the implementation in durabletask](https://github.com/dapr/durabletask-python/blob/2cab991f0d2def6a83bad63af3b925e9e756af80/durabletask/worker.py#L1094-L1097).