Add tests for ProgramBuilder start and stop action #56
Description
crate async_runtime
├── mod program: pub
│ └── struct ProgramBuilder: pub
│ ├── fn with_start_action: pub
│ └── fn with_stop_action: pub
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crate async_runtime
├── mod program: pub
│ └── struct ProgramBuilder: pub
│ ├── fn with_start_action: pub
│ └── fn with_stop_action: pub