Introduce features - closes #1901 (#1928)

_data/chains/eip155-1.json

@@ -8,6 +8,7 @@
     "https://api.mycryptoapi.com/eth",
     "https://cloudflare-eth.com"
   ],
+  "features": [{ "name": "EIP155" }, { "name": "EIP1559" }],
   "faucets": [],
   "nativeCurrency": {
     "name": "Ether",

processor/src/main/kotlin/org/ethereum/lists/chains/Env.kt

@@ -20,6 +20,7 @@ val mandatory_fields = listOf(
     "nativeCurrency"
 )
 val optionalFields = listOf(
+    "features",
     "slip44",
     "ens",
     "icon",

tools/schema/chainSchema.json

@@ -36,7 +36,19 @@
                 "type":"string"
             }
         },
-        "nativeCurrency":{
+        "features":{
+	    "type":"array",
+            "items":{
+                "type":"object",
+                "properties": {
+                    "name":{
+                        "type":"string",
+			"description": "feature name - e.g. EIP155"
+                    }
+                }
+	    }
+	},
+        "nativeCurrency":{	    
             "type":"object",
             "properties": {
                 "name":{
@@ -129,4 +141,4 @@
         }
     },
     "additionalProperties": false
-}
+}