feat: add onyx on initia mainet (#588)

Author: ALPAC-4

mainnets/initia/assetlist.json

@@ -464,6 +464,46 @@
       "logo_URIs": {
         "png": "https://raw.githubusercontent.com/initia-labs/initia-registry/main/images/BFB.png"
       }
+    },
+    {
+      "description": "ONYX",
+      "denom_units": [
+        {
+          "denom": "ibc/74CDBCE5F520CD29B32692645382E168032121F7DC3B3FDC79B0D37FB4E0916D",
+          "exponent": 0
+        },
+        {
+          "denom": "ONYX",
+          "exponent": 6
+        }
+      ],
+      "base": "ibc/74CDBCE5F520CD29B32692645382E168032121F7DC3B3FDC79B0D37FB4E0916D",
+      "display": "ONYX",
+      "name": "ONYX",
+      "symbol": "ONYX",
+      "coingecko_id": "",
+      "traces": [
+        {
+          "type": "ibc",
+          "counterparty": {
+            "chain_name": "yominet",
+            "base_denom": "evm/44CFAaB1cF49996540A6B6A87d1f0a604267E6b0",
+            "channel_id": "channel-0"
+          },
+          "chain": {
+            "channel_id": "channel-25",
+            "path": "transfer/channel-25/evm/44CFAaB1cF49996540A6B6A87d1f0a604267E6b0"
+          }
+        }
+      ],
+      "images": [
+        {
+          "png": "https://raw.githubusercontent.com/initia-labs/initia-registry/main/images/onyx.png"
+        }
+      ],
+      "logo_URIs": {
+        "png": "https://raw.githubusercontent.com/initia-labs/initia-registry/main/images/onyx.png"
+      }
     }
   ]
 }