NetworkPkg: Add HTTP Additional Event Notifications

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3496

Add new EDKII_HTTP_CALLBACK_PROTOCOL in NetworkPkg,
Send HTTP Events via EDKII_HTTP_CALLBACK_PROTOCOL
when Dns/ConnectTcp/TlsConnectSession/InitSession
occurs.

Signed-off-by: Heng Luo <heng.luo@intel.com>
Cc: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Reviewed-by: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Reviewed-by: Jiaxin Wu <jiaxin.wu@intel.com>

NetworkPkg/HttpDxe/HttpProto.h

@@ -608,4 +608,17 @@ HttpResponseWorker (
   IN  HTTP_TOKEN_WRAP           *Wrap
   );
 
+/**
+  Send Events via EDKII_HTTP_CALLBACK_PROTOCOL.
+
+  @param[in]  Event               The event that occurs in the current state.
+  @param[in]  EventStatus         The Status of Event, EFI_SUCCESS or other errors.
+
+**/
+VOID
+HttpNotify (
+  IN  EDKII_HTTP_CALLBACK_EVENT         Event,
+  IN  EFI_STATUS                        EventStatus
+  );
+
 #endif