Implementation of Exchange GetOrder through GRPC for Coinbase (#453)

* fix 440: SubmitOrder and CB-ACCESS-TIMESTAMP value

* removed gctcli executable and added it to gitignore

* implemented GetOrderInfo

* getOrder also has trades attached to an order

* getOrder also has trades attached to an order

* fix 440: SubmitOrder and CB-ACCESS-TIMESTAMP value

* removed gctcli executable and added it to gitignore

* fix 440: SubmitOrder and CB-ACCESS-TIMESTAMP value

* removed gctcli executable and added it to gitignore

* minor

* go lint fixes

* removed clutter

* fixed Amount, Executed Amount, Remaining Amount

* removed default value declarations

* removed useless nil chceck

* iteration rewritten go style from java style

* returning error if GetFills fails

* returning error if GetOrderInfo fails

* ExecutedAmont value is FilledSize

* added TODO to fix asset type

* chnages after merging #446

* range without copy value, using index

* removed useless slice initialisation

* couple of nits from code review

* fix indentation

* Update rpc.proto

Fixes indentation

Co-authored-by: Adrian Gallagher <thrasher@addictionsoftware.com>

gctrpc/rpc.swagger.json

@@ -2952,6 +2952,16 @@
         "open_volume": {
           "type": "number",
           "format": "double"
+        },
+        "fee": {
+          "type": "number",
+          "format": "double"
+        },
+        "trades": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/gctrpcTradeHistory"
+          }
         }
       }
     },
@@ -3242,6 +3252,39 @@
         }
       }
     },
+    "gctrpcTradeHistory": {
+      "type": "object",
+      "properties": {
+        "creation_time": {
+          "type": "string",
+          "format": "int64"
+        },
+        "id": {
+          "type": "string"
+        },
+        "price": {
+          "type": "number",
+          "format": "double"
+        },
+        "amount": {
+          "type": "number",
+          "format": "double"
+        },
+        "exchange": {
+          "type": "string"
+        },
+        "asset_type": {
+          "type": "string"
+        },
+        "order_side": {
+          "type": "string"
+        },
+        "fee": {
+          "type": "number",
+          "format": "double"
+        }
+      }
+    },
     "gctrpcWhaleBombRequest": {
       "type": "object",
       "properties": {