analytics: 3p NC: Defines interface EventLogger for Analytics logger.

- this is the init cl.

doc: go/nc-analytics-api
PiperOrigin-RevId: 391901111

cpp/core/BUILD

@@ -28,6 +28,7 @@ cc_library(
     ],
     deps = [
         ":core_types",
+        ":event_logger",
         "//absl/strings",
         "//absl/time",
         "//absl/types:span",
@@ -66,6 +67,16 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "event_logger",
+    hdrs = [
+        "event_logger.h",
+    ],
+    deps = [
+        "//logs/proto/location/nearby:nearby_client_log_cc_proto",
+    ],
+)
+
 cc_test(
     name = "core_test",
     size = "small",