Add optional gRpcUrls field to ChainMetadata schema (#3163)

### Description

- Add optional gRpcUrls field to ChainMetadata schema
- Enforce inclusion of restUrls and gRpcUrls for cosmos chains
- Fix neutron rest url 

### Related Issues

Fixes https://github.com/hyperlane-xyz/hyperlane-monorepo/issues/3161

### Backward compatibility

Yes

### Testing

Unit test

.changeset/light-coins-walk.md

@@ -0,0 +1,5 @@
+---
+'@hyperlane-xyz/sdk': patch
+---
+
+Add optional grpcUrl field to ChainMetadata

typescript/sdk/src/consts/chainMetadata.ts

@@ -601,6 +601,7 @@ export const neutron: ChainMetadata = {
   chainId: 'neutron-1',
   displayName: 'Neutron',
   domainId: 1853125230,
+  grpcUrls: [{ http: 'grpc-kralum.neutron-1.neutron.org:80' }],
   isTestnet: false,
   name: Chains.neutron,
   nativeToken: {
@@ -609,7 +610,7 @@ export const neutron: ChainMetadata = {
     symbol: 'NTRN',
   },
   protocol: ProtocolType.Cosmos,
-  restUrls: [{ http: 'grpc-kralum.neutron-1.neutron.org:80' }],
+  restUrls: [{ http: 'https://rest-lb.neutron.org' }],
   rpcUrls: [{ http: 'https://rpc-kralum.neutron-1.neutron.org' }],
   slip44: 118,
 };

typescript/sdk/src/metadata/chainMetadata.test.ts

@@ -60,6 +60,8 @@ describe('ChainMetadataSchema', () => {
         chainId: 'cosmos',
         bech32Prefix: 'cosmos',
         slip44: 118,
+        restUrls: [],
+        grpcUrls: [],
       }),
     ).to.eq(true);
   });

typescript/sdk/src/metadata/chainMetadataTypes.ts

@@ -111,6 +111,10 @@ export const ChainMetadataSchemaObject = z.object({
     .array(RpcUrlSchema)
     .describe('For cosmos chains only, a list of Rest API URLs')
     .optional(),
+  grpcUrls: z
+    .array(RpcUrlSchema)
+    .describe('For cosmos chains only, a list of gRPC API URLs')
+    .optional(),
   blockExplorers: z
     .array(
       z.object({
@@ -216,6 +220,20 @@ export const ChainMetadataSchema = ChainMetadataSchemaObject.refine(
       message: 'Bech32Prefix and Slip44 required for Cosmos chains',
       path: ['bech32Prefix', 'slip44'],
     },
+  )
+  .refine(
+    (metadata) => {
+      if (
+        metadata.protocol === ProtocolType.Cosmos &&
+        (!metadata.restUrls || !metadata.grpcUrls)
+      )
+        return false;
+      else return true;
+    },
+    {
+      message: 'Rest and gRPC URLs required for Cosmos chains',
+      path: ['restUrls', 'grpcUrls'],
+    },
   );
 
 export type ChainMetadata<Ext = object> = z.infer<typeof ChainMetadataSchema> &