Tracing in Wasm Components.

[fawadasaurus]

Is your feature request related to a problem? Please describe.
It would be really nice to have a streaming channel dedicated to tracing for wasmrs components. This would allow realtime feedback and telemetry from long running wasm components.

Propose a solution
When developing a component in rust, there should be a function that allows for tracing to be passed back to the Wick runtime. I am not sure how time should be calculated here, that may be something for Wick to handle.

...
The attributes are important to be configurable by the developer.
let tracing = wick_component:start_span(span_name: String, attributes: Struct);
...
tracing.send_span_event!(Log: Struct);
...
tracing.end_span; //likely needs to be explicit so that wick can calculate the start and end time?
... 

Describe alternatives you've considered
None

Additional context
None

[jsoverson]

The foundation for this was added in #289 with the added __event FnF host operation. We need to build a tracing subscriber that propagates spans and events through that call to the host.