Add giwa testnet and mainnet (#7707)

* Add GIWA Sepolia

* Add GIWA Testnet icon

* Add GIWA Mainnet

Author: ihooni

_data/chains/eip155-9134.json

@@ -0,0 +1,16 @@
+{
+  "name": "GIWA",
+  "chain": "ETH",
+  "rpc": [],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "Ether",
+    "symbol": "ETH",
+    "decimals": 18
+  },
+  "infoURL": "https://giwa.io",
+  "shortName": "giwa",
+  "chainId": 9134,
+  "networkId": 9134,
+  "status": "incubating"
+}

_data/chains/eip155-91342.json

@@ -0,0 +1,25 @@
+{
+  "name": "GIWA Sepolia Testnet",
+  "chain": "ETH",
+  "rpc": ["https://sepolia-rpc.giwa.io"],
+  "faucets": ["https://faucet.giwa.io"],
+  "nativeCurrency": {
+    "name": "Sepolia Ether",
+    "symbol": "ETH",
+    "decimals": 18
+  },
+  "infoURL": "https://giwa.io",
+  "shortName": "giwasepolia",
+  "chainId": 91342,
+  "networkId": 91342,
+  "slip44": 1,
+  "icon": "giwaTestnet",
+  "explorers": [
+    {
+      "name": "GIWA Sepolia Blockscout",
+      "url": "https://sepolia-explorer.giwa.io",
+      "icon": "blockscout",
+      "standard": "EIP3091"
+    }
+  ]
+}

_data/icons/giwaTestnet.json

@@ -0,0 +1,8 @@
+[
+  {
+    "url": "ipfs://bafkreie3xhbmcwv5qqopq7ak5n5wmqncy6ewnxgi772vytmssmqrubngbm",
+    "width": 128,
+    "height": 128,
+    "format": "svg"
+  }
+]