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/span.py

@@ -0,0 +1,46 @@
+from typing import TYPE_CHECKING
+from dataclasses import dataclass
+from typing import Any, Dict
+from tracing.utils import swallow_exceptions
+
+if TYPE_CHECKING:
+    from tracing.tracer import Tracer
+
+@dataclass
+class TraceSpan:
+    """Span handle bound to a tracer.
+
+    Provides helpers to add attributes/events/status/exception that
+    will never propagate exceptions.
+    """
+
+    name: str
+    kind: str  # "SERVER" | "CLIENT" | "INTERNAL"
+    start_ns: int
+    trace_id: str
+    span_id: str
+    parent_span_id: str
+    attributes: Dict[str, Any]
+    tracer: "Tracer"
+
+    @swallow_exceptions
+    def set_attribute(self, key: str, value: Any) -> None:
+        self.attributes[key] = value
+        self.tracer._notify_attribute(self, key, value)
+
+    @swallow_exceptions
+    def add_event(self, name: str, **attrs: Any) -> None:
+        self.tracer._notify_event(self, name, attrs)
+
+    @swallow_exceptions
+    def set_status(self, code: str, description: str = "") -> None:
+        self.attributes["status.code"] = code
+        if description:
+            self.attributes["status.description"] = description
+        self.tracer._notify_status(self, code, description)
+
+    @swallow_exceptions
+    def record_exception(self, exc: BaseException) -> None:
+        self.tracer._notify_exception(self, exc)
+
+