feat: Add chain Metadata type (#2731)

Author: jnsdls

.changeset/brave-books-exist.md

@@ -0,0 +1,5 @@
+---
+"thirdweb": patch
+---
+
+export `ChainMetadata` type from `thirdweb/chains`

biome.json

@@ -15,6 +15,7 @@
   },
   "files": {
     "ignore": [
+      "legacy_packages/**",
       "packages/thirdweb/src/crypto/aes/lib/md5.ts",
       "packages/thirdweb/src/utils/promise/p-limit.ts",
       "packages/thirdweb/src/utils/bytecode/cbor-decode.ts",

packages/thirdweb/src/exports/chains.ts

@@ -1,5 +1,7 @@
 // chain type
 export type { Chain } from "../chains/types.js";
+// chain Metadata type
+export type { ChainMetadata } from "../chains/types.js";
 // define chain, chainMetadata
 export {
   defineChain,