Signoz types

[trashhalo]

I'm working on #23 and I noticed that this repo does not depend on any piece of signoz so it re-creates the API inputs as its own struts.

I planned on adding the API types to the go mod so I can reference the dashboard types without having to re-create them since they're so deep. But I wanted to check in. Was it an intentional design decision to not depend on signoz? If so, I can copy and paste the types in here, but I wasn't sure.