exchanges/engine: Add multichain deposit/withdrawal support (#794)

* Add exchange multichain support

* Start tidying up

* Add multichain transfer support for Bitfinex and fix poloniex bug

* Add Coinbene multichain support

* Start adjusting the deposit address manager

* Fix deposit tests and further enhancements

* Cleanup

* Add bypass flag, expand tests plus error coverage for Huobi

Adjust helpers

* Address nitterinos

* BFX wd changes

* Address nitterinos

* Minor fixes rebasing on master

* Fix BFX acceptableMethods test

* Add some TO-DOs for 2 tests WRT races

* Fix acceptableMethods test round 2

* Address nitterinos

gctrpc/rpc.swagger.json

@@ -1127,6 +1127,38 @@
         ]
       }
     },
+    "/v1/getavailabletransferchains": {
+      "post": {
+        "operationId": "GoCryptoTrader_GetAvailableTransferChains",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/gctrpcGetAvailableTransferChainsResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/gctrpcGetAvailableTransferChainsRequest"
+            }
+          }
+        ],
+        "tags": [
+          "GoCryptoTrader"
+        ]
+      }
+    },
     "/v1/getcommunicationrelayers": {
       "get": {
         "operationId": "GoCryptoTrader_GetCommunicationRelayers",
@@ -3656,6 +3688,31 @@
         }
       }
     },
+    "gctrpcDepositAddress": {
+      "type": "object",
+      "properties": {
+        "address": {
+          "type": "string"
+        },
+        "tag": {
+          "type": "string"
+        },
+        "chain": {
+          "type": "string"
+        }
+      }
+    },
+    "gctrpcDepositAddresses": {
+      "type": "object",
+      "properties": {
+        "addresses": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/gctrpcDepositAddress"
+          }
+        }
+      }
+    },
     "gctrpcFiatWithdrawalEvent": {
       "type": "object",
       "properties": {
@@ -3891,6 +3948,28 @@
         }
       }
     },
+    "gctrpcGetAvailableTransferChainsRequest": {
+      "type": "object",
+      "properties": {
+        "exchange": {
+          "type": "string"
+        },
+        "cryptocurrency": {
+          "type": "string"
+        }
+      }
+    },
+    "gctrpcGetAvailableTransferChainsResponse": {
+      "type": "object",
+      "properties": {
+        "chains": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        }
+      }
+    },
     "gctrpcGetCommunicationRelayersResponse": {
       "type": "object",
       "properties": {
@@ -3919,6 +3998,12 @@
         },
         "cryptocurrency": {
           "type": "string"
+        },
+        "chain": {
+          "type": "string"
+        },
+        "bypass": {
+          "type": "boolean"
         }
       }
     },
@@ -3927,6 +4012,9 @@
       "properties": {
         "address": {
           "type": "string"
+        },
+        "tag": {
+          "type": "string"
         }
       }
     },
@@ -3944,7 +4032,7 @@
         "addresses": {
           "type": "object",
           "additionalProperties": {
-            "type": "string"
+            "$ref": "#/definitions/gctrpcDepositAddresses"
           }
         }
       }
@@ -5075,6 +5163,9 @@
         },
         "description": {
           "type": "string"
+        },
+        "chain": {
+          "type": "string"
         }
       }
     },