Created a separate package for tracing-related stuff

Added mirroring of spans into Sentry
Tracer is a facade that redirects actions to tracing backends

cmapi/tracing/backend.py

@@ -0,0 +1,37 @@
+from abc import ABC, abstractmethod
+from typing import Any, Dict, Optional
+
+from tracing.span import TraceSpan
+
+
+class TracerBackend(ABC):
+    @abstractmethod
+    def on_span_start(self, span: TraceSpan) -> None:
+        raise NotImplementedError
+
+    @abstractmethod
+    def on_span_end(self, span: TraceSpan, exc: Optional[BaseException]) -> None:
+        raise NotImplementedError
+
+    def on_span_event(self, span: TraceSpan, name: str, attrs: Dict[str, Any]) -> None:
+        return
+
+    def on_span_status(self, span: TraceSpan, code: str, description: str) -> None:
+        return
+
+    def on_span_exception(self, span: TraceSpan, exc: BaseException) -> None:
+        return
+
+    def on_span_attribute(self, span: TraceSpan, key: str, value: Any) -> None:
+        return
+
+    def on_inject_headers(self, headers: Dict[str, str]) -> None:
+        return
+
+    def on_incoming_request(self, headers: Dict[str, str], method: str, path: str) -> None:
+        return
+
+    def on_request_finished(self, status_code: Optional[int]) -> None:
+        return
+
+