Introduce OT prefix

[ncreated]

Hello 👋. I came across this project, as I work on a tracer implementation.

The problem

Because of the naming convention opentracing-swift enforces, I'll have to prefix all constructs in my implementation with a custom string, e.g. DDTracer or namespace things by explicitly pointing to the package:

public class Tracer: OpenTracing.Tracer {
   // ...
}

The latter however, might be inconvenient and misleading for users when they import both my implementation and OpenTracing.

Proposed solution

IMHO we might introduce OT prefix in opentracing-swift:

• OTTracer,
• OTSpan,
• OTReference,
• OTGlobal,
• ... .

Similar way to what opentracing-objc does.

This will:

• minimise the number of prefixes that tracer users have to play with,
• increase the OT APIs discoverability for tracer developers,
• let people avoid conflicts with the generic names like Reference or Global that they may already use in their projects.

I'm curious what's your take on this 🙂?