Multi App Workflow Support

[cicoyle]

As of 1.16 Dapr now supports Multi-App Workflows , where Workflows and Activities can be hosted across many apps.

We should support this in the rust sdk. This means adding support for callactivity and suborchestration calls, include an example in the examples directory and an IT test supporting the validation of a successful implementation.

Reference implementation examples:
java sdk callActivity PR
durabletask-java callActivity PR
callactivity durabletask-go PR
suborchestration durabletask-go PR

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 60 days. It will be closed in the next 7 days unless it is tagged (pinned, good first issue, help wanted) or other activity occurs. Thank you for your contributions.

[github-actions]

This issue has been automatically closed because it has not had activity in the last 67 days. If this issue is still valid, please ping a maintainer and ask them to label it as pinned, good first issue or help wanted. Thank you for your contributions.