Add SIP for configuring and emitting observability

[calebschoepp]

Rendered view

[lann]

This is probably worth giving its own section, e.g. [component.my-component.tracing]. In addition to toggling propagation we may want to have options to e.g. disable tracing entirely for particularly high-frequency components, customize span names, add metadata, etc.

Note that TOML would also let you write this as e.g.

[component.my-component]
tracing = { context_propagation = true }

[calebschoepp]

Good call. I'll make the change and add some of the obvious config to it.

[calebschoepp]

I've stripped down this SIP to cover what has already been done. I'll give a few days for review and if I don't get any engagement I'll just merge it b/c the intention is basically just to track the work that has already been done.