feat: notification-services-controller - add shared notification bloc…

…k explorer domains (#4552)

## Explanation

This is so we can easily reuse these block explorers for all platforms
that consume notifications. We may start moving more shared logic to
shared libraries for this same reason.

## References

https://consensyssoftware.atlassian.net/browse/NOTIFY-941

## Changelog

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### `@metamask/notification-services-controller`

- **ADDED**: New constant for the block explorers for chains we support
notifications for.

## Checklist

- [x] I've updated the test suite for new or updated code as appropriate
- [x] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [x] I've highlighted breaking changes using the "BREAKING" category
above as appropriate

packages/notification-services-controller/src/NotificationServicesController/ui/constants.ts

@@ -20,4 +20,47 @@ export const NOTIFICATION_NETWORK_CURRENCY_SYMBOL = {
   [NOTIFICATION_CHAINS_ID.POLYGON]: 'MATIC',
 };
 
+export type BlockExplorerConfig = {
+  url: string;
+  name: string;
+};
+
+export const SUPPORTED_NOTIFICATION_BLOCK_EXPLORERS = {
+  // ETHEREUM
+  [NOTIFICATION_CHAINS_ID.ETHEREUM]: {
+    url: 'https://etherscan.io',
+    name: 'Etherscan',
+  },
+  // OPTIMISM
+  [NOTIFICATION_CHAINS_ID.OPTIMISM]: {
+    url: 'https://optimistic.etherscan.io',
+    name: 'Optimistic Etherscan',
+  },
+  // BSC
+  [NOTIFICATION_CHAINS_ID.BSC]: {
+    url: 'https://bscscan.com',
+    name: 'BscScan',
+  },
+  // POLYGON
+  [NOTIFICATION_CHAINS_ID.POLYGON]: {
+    url: 'https://polygonscan.com',
+    name: 'PolygonScan',
+  },
+  // ARBITRUM
+  [NOTIFICATION_CHAINS_ID.ARBITRUM]: {
+    url: 'https://arbiscan.io',
+    name: 'Arbiscan',
+  },
+  // AVALANCHE
+  [NOTIFICATION_CHAINS_ID.AVALANCHE]: {
+    url: 'https://snowtrace.io',
+    name: 'Snowtrace',
+  },
+  // LINEA
+  [NOTIFICATION_CHAINS_ID.LINEA]: {
+    url: 'https://lineascan.build',
+    name: 'LineaScan',
+  },
+} satisfies Record<string, BlockExplorerConfig>;
+
 export { NOTIFICATION_CHAINS_ID } from '../constants/notification-schema';