[DI] create a new key for threadLocalDebugInfo (pytorch#48762)

Summary:
Pull Request resolved: pytorch#48762

In distributed inference, we want to use a new type info to pass some information to operators. add a new key to threadLocalDebugInfo to unblock the development.

Test Plan: Only add a new key. Should have not effect on current build.

Reviewed By: dzhulgakov

Differential Revision: D25291242

fbshipit-source-id: c71565ff7a38cc514d7cd65246c7d5f6b2ce3b8b

c10/util/ThreadLocalDebugInfo.h

@@ -13,6 +13,7 @@ enum class C10_API_ENUM DebugInfoKind : uint8_t {
   PRODUCER_INFO = 0,
   MOBILE_RUNTIME_INFO,
   PROFILER_STATE,
+  INFERENCE_CONTEXT, // for inference usage
 
   TEST_INFO, // used only in tests
   TEST_INFO_2, // used only in tests