feat: support process discovery v2 schema

Author: dmehala

test/test_tracer.cpp

@@ -1851,7 +1851,9 @@ TEST_TRACER("APM tracing disabled") {
       auto finalized_config = finalize_config(config, clock);
       REQUIRE(finalized_config);
       Tracer tracer{*finalized_config};
-      { auto root1 = tracer.create_span(); }
+      {
+        auto root1 = tracer.create_span();
+      }
       REQUIRE(collector->chunks.size() == 1);
       REQUIRE(collector->chunks.front().size() == 1);
 
@@ -1930,7 +1932,9 @@ TEST_TRACER("APM tracing disabled") {
 
     // When APM Tracing is disabled, we allow one trace per second for service
     // liveness. To ensure consistency, consume the limiter slot.
-    { tracer.create_span(); }
+    {
+      tracer.create_span();
+    }
     collector->chunks.clear();
 
     // Case 1: extracted context with priority, but no `_dd.p.ts` → depends if