chore: Update sdk_metadata features (#509)

Adds features metadata to .sdk_metadata.json for both the C++ Client SDK and C++ Server SDK.

C++ Client SDK (12 features): allFlags, appMetadata, bigSegments, contexts, experimentation, flagChanges, inlineContextCustomEvents, offlineMode, privateAttrs, relayProxyProxy, track, variationDetail

C++ Server SDK (16 features): allFlags, appMetadata, contexts, experimentation, fileDataSource, hooks, inlineContextCustomEvents, offlineMode, privateAttrs, relayProxyDaemon, relayProxyProxy, storingData, storingDataRedis, testDataSource, track, variationDetail

Author: devin-ai-integration[bot]

.sdk_metadata.json

@@ -12,7 +12,21 @@
       "releases": {
         "tag-prefix": "launchdarkly-cpp-client-"
       },
-      "userAgents": ["CPPClient"]
+      "userAgents": ["CPPClient"],
+      "features": {
+        "allFlags": { "introduced": "1.0" },
+        "appMetadata": { "introduced": "3.0" },
+        "bigSegments": { "introduced": "1.0" },
+        "contexts": { "introduced": "3.0" },
+        "experimentation": { "introduced": "2.4.8" },
+        "flagChanges": { "introduced": "1.0" },
+        "inlineContextCustomEvents": { "introduced": "3.10" },
+        "offlineMode": { "introduced": "1.0" },
+        "privateAttrs": { "introduced": "1.0" },
+        "relayProxyProxy": { "introduced": "1.0" },
+        "track": { "introduced": "1.0" },
+        "variationDetail": { "introduced": "1.1" }
+      }
     },
     "cpp-server-sdk": {
       "name": "C++ Server SDK",
@@ -25,7 +39,25 @@
       "releases": {
         "tag-prefix": "launchdarkly-cpp-server-"
       },
-      "userAgents": ["CPPServer"]
+      "userAgents": ["CPPServer"],
+      "features": {
+        "allFlags": { "introduced": "1.0" },
+        "appMetadata": { "introduced": "3.0" },
+        "contexts": { "introduced": "3.0" },
+        "experimentation": { "introduced": "2.4" },
+        "fileDataSource": { "introduced": "2.6" },
+        "hooks": { "introduced": "3.10" },
+        "inlineContextCustomEvents": { "introduced": "3.9" },
+        "offlineMode": { "introduced": "1.0" },
+        "privateAttrs": { "introduced": "1.0" },
+        "relayProxyDaemon": { "introduced": "1.2" },
+        "relayProxyProxy": { "introduced": "1.0" },
+        "storingData": { "introduced": "1.2" },
+        "storingDataRedis": { "introduced": "1.2" },
+        "testDataSource": { "introduced": "2.6" },
+        "track": { "introduced": "1.0" },
+        "variationDetail": { "introduced": "1.0" }
+      }
     }
   }
 }