Add Oasis Sapphire & Emerald chains

packages/chains/src/emerald.ts

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+import { Chain } from './types'
+
+export const emerald = {
+  id: 42262,
+  name: 'Oasis Emerald',
+  network: 'emerald',
+  nativeCurrency: {
+    decimals: 18,
+    name: 'Oasis ROSE',
+    symbol: 'ROSE',
+  },
+  rpcUrls: {
+    default: { http: ['https://emerald.oasis.dev'], 'webSocket': ['wss://emerald.oasis.dev/ws'] },
+    public:  { http: ['https://emerald.oasis.dev'], 'webSocket': ['wss://emerald.oasis.dev/ws'] },
+  },
+  blockExplorers: {
+    default: { name: 'Oasis Explorer', url: 'https://explorer.emerald.oasis.dev' },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 1481392,
+    },
+  },
+} as const satisfies Chain

packages/chains/src/sapphire.ts

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+import { Chain } from './types'
+
+export const sapphire = {
+  id: 23294,
+  name: 'Oasis Sapphire',
+  network: 'sapphire',
+  nativeCurrency: {
+    decimals: 18,
+    name: 'Oasis ROSE',
+    symbol: 'ROSE',
+  },
+  rpcUrls: {
+    default: { http: ['https://sapphire.oasis.io'], webSocket: ['wss://sapphire.oasis.io/ws'] },
+    public: { http: ['https://sapphire.oasis.io'], webSocket: ['wss://sapphire.oasis.io/ws'] },
+  },
+  blockExplorers: {
+    default: { name: 'Oasis Explorer', url: 'https://explorer.oasis.io/mainnet/sapphire' },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 734531,
+    },
+  },
+} as const satisfies Chain

packages/chains/src/sapphireTestnet.ts

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+import { Chain } from './types'
+
+export const sapphireTestnet = {
+  id: 23295,
+  name: 'Oasis Sapphire Testnet',
+  network: 'sapphireTestnet',
+  nativeCurrency: {
+    decimals: 18,
+    name: 'Oasis TEST',
+    symbol: 'TEST',
+  },
+  rpcUrls: {
+    default: { http: ['https://testnet.sapphire.oasis.dev'], webSocket: ['wss://testnet.sapphire.oasis.dev/ws'] },
+    public: { http: ['https://testnet.sapphire.oasis.dev'], webSocket: ['wss://testnet.sapphire.oasis.dev/ws'] },
+  },
+  blockExplorers: {
+    default: { name: 'Oasis Explorer', url: 'https://explorer.oasis.io/testnet/sapphire' },
+  },
+} as const satisfies Chain