feat: dd-trace 5.0 to 6.0 - rewrite Span.addLink object argument

[mohab-sameh]

Summary

Rewrite the removed Span.addLink(spanContext, attributes) overload to the v6
single-argument shape.

Detection Criteria

Find .addLink(...) member calls with exactly two positional arguments when the
receiver is a Datadog span factory result, a local variable initialized from one,
or a parameter typed as Span imported from dd-trace.

Transformation Logic

Replace the two arguments with one object literal:
{ context: <first-arg>, attributes: <second-arg> }.

Before / After Example

span.addLink(otherSpan.context(), { foo: "bar" });

span.addLink({ context: otherSpan.context(), attributes: { foo: "bar" } });

Notes / Edge Cases

Skip calls that already use the object shape or have any arity other than two.