Import Path Inconsistency (openai#960)

There's an inconsistent import style in the tracing module where one
import uses an absolute path in line number 3 while all others use
relative imports

Additionally: Also fixed the ordering of the imports

Author: DanielHashmi

src/agents/tracing/__init__.py

@@ -1,7 +1,5 @@
 import atexit
 
-from agents.tracing.provider import DefaultTraceProvider, TraceProvider
-
 from .create import (
     agent_span,
     custom_span,
@@ -20,6 +18,7 @@
 )
 from .processor_interface import TracingProcessor
 from .processors import default_exporter, default_processor
+from .provider import DefaultTraceProvider, TraceProvider
 from .setup import get_trace_provider, set_trace_provider
 from .span_data import (
     AgentSpanData,