[BUG] TracerFactory should return wrapped tracer

[Gaganjuneja]

Describe the bug
As per comment in this PR, we should return the wrapped Tracer from TracerFactory.

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[Gaganjuneja]

@suranjay Can you please take this up? We can simply write a new implementation of Tracer as a WrappedTracer which can wrap the getTracer() behaviour.

[suranjay]

@suranjay Can you please take this up? We can simply write a new implementation of Tracer as a WrappedTracer which can wrap the getTracer() behaviour.

Sure, on it!