Validator metadata name matches key (#1918)

### Description

If you use a different name, then MP lookup can fail. Thus we should
validate that the key matches the name

typescript/sdk/src/providers/MultiProvider.ts

@@ -40,9 +40,13 @@ export class MultiProvider {
     chainMetadata: ChainMap<ChainMetadata> = defaultChainMetadata,
     options: MultiProviderOptions = {},
   ) {
-    Object.values(chainMetadata).forEach((cm) => {
+    Object.entries(chainMetadata).forEach(([key, cm]) => {
       if (!isValidChainMetadata(cm))
         throw new Error(`Invalid chain metadata for ${cm.chainId}`);
+      if (key !== cm.name)
+        throw new Error(
+          `Chain name mismatch: Key was ${key}, but name is ${cm.name}`,
+        );
     });
 
     this.metadata = chainMetadata;