EPE-972:Add support for std::tuple in eosio.cdt

tests/toolchain/abigen-pass/nested_container.abi

@@ -0,0 +1,80 @@
+{
+    "____comment": "This file was generated with eosio-abigen. DO NOT EDIT ",
+    "version": "eosio::abi/1.2",
+    "types": [],
+    "structs": [
+        {
+            "name": "map2map",
+            "base": "",
+            "fields": [
+                {
+                    "name": "m",
+                    "type": "pair_string_string[]"
+                },
+                {
+                    "name": "m2m",
+                    "type": "pair_string_pair_string_string[][]"
+                }
+            ]
+        },
+        {
+            "name": "pair_string_pair_string_string",
+            "base": "",
+            "fields": [
+                {
+                    "name": "key",
+                    "type": "string"
+                },
+                {
+                    "name": "value",
+                    "type": "pair_string_string[]"
+                }
+            ]
+        },
+        {
+            "name": "pair_string_string",
+            "base": "",
+            "fields": [
+                {
+                    "name": "key",
+                    "type": "string"
+                },
+                {
+                    "name": "value",
+                    "type": "string"
+                }
+            ]
+        },
+        {
+            "name": "settuple2",
+            "base": "",
+            "fields": [
+                {
+                    "name": "user",
+                    "type": "name"
+                },
+                {
+                    "name": "tp2",
+                    "type": "tuple_int32_float64_string_int32[]"
+                }
+            ]
+        }
+    ],
+    "actions": [
+        {
+            "name": "map2map",
+            "type": "map2map",
+            "ricardian_contract": ""
+        },
+        {
+            "name": "settuple2",
+            "type": "settuple2",
+            "ricardian_contract": ""
+        }
+    ],
+    "tables": [],
+    "kv_tables": {},
+    "ricardian_clauses": [],
+    "variants": [],
+    "action_results": []
+}

tests/toolchain/abigen-pass/nested_container.cpp

@@ -0,0 +1,20 @@
+#include <eosio/eosio.hpp>
+#include <tuple>
+#include <vector>
+
+using namespace eosio;
+using std::map;
+using std::string;
+using std::tuple;
+using std::vector;
+
+class [[eosio::contract]] nested_container : public contract {
+public:
+   using contract::contract;
+
+    [[eosio::action]] 
+    void map2map(map<string, string> m, map<string, map<string, string>> m2m) {}
+
+    [[eosio::action]]
+    void settuple2(name user, const tuple  <int, double, string, vector<int> >& tp2) {}
+};

tests/toolchain/abigen-pass/nested_container.json

@@ -0,0 +1,9 @@
+{
+    "tests" : [
+       {
+          "expected" : {
+             "abi-file" : "nested_container.abi"
+          }
+       }
+    ]
+}