fix: add explicit module declaration to type definitions (#16219)

web3.js/rollup.config.types.js

@@ -0,0 +1,7 @@
+import dts from 'rollup-plugin-dts';
+
+export default {
+  input: './declarations/index.d.ts',
+  output: [{file: 'lib/index.d.ts', format: 'es'}],
+  plugins: [dts()],
+};