Move functions and API needed by the plugins to the src_common directory

src_common/extra_info.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "tokens.h"
+#include "nft.h"
+
+typedef union extraInfo_t {
+    tokenDefinition_t token;
+    nftInfo_t nft;
+} extraInfo_t;