Support for Span link with good DX interface and demo presentation

[ManiMozaffar]

Description

I couldn't find anywhere in docs where it mentioned about span links. That might be something logfire is missing at the moment.
https://opentelemetry.io/docs/concepts/signals/traces/#span-links

It'd be nice to also have this on example, linking a span from frontend, to the backend. I'm interested how that would look in the dashboard as well.
Currently otel sdk interface for span link is some kind of horrible. but I'm questioning if that can be designed better or not.

[adriangb]

It's something we're actively working on adding.

Do you have any suggestions for APIs you'd like in the SDK?

[ManiMozaffar]

Do you have any suggestions for APIs you'd like in the SDK?

Not really, we instrumented kafka batch process and consuming, which then show a really nice links from the first span (message) to the last one. but overall the module that instrumented were a bit messy and highly complicated.
But what I found even more complicated, is how to allow react, our client, to link spans from frontend to the related backend request? If this is show-cased in the demo project, it'd be awesome.