[otap-dataflow] pipeline engine timer control

[albertlockett]

There's a control message called TimerTick. The intention here is for components of the pipeline to register a new timer with the pipeline engine, and the engine will periodically send a TimerTick control message into this component.

See the implementation in experimental beaubourg for inspiration:
https://github.com/open-telemetry/otel-arrow/blob/main/rust/beaubourg/crates/signal/src/lib.rs

Prerequisite:

• [otap-dataflow] emit control message from pipeline components using effect handler #498