chore: remove isa method from smithy-client

Author: trivikr

packages/smithy-client/src/index.ts

@@ -5,7 +5,6 @@ export * from "./exception";
 export * from "./extended-encode-uri-component";
 export * from "./get-array-if-single-item";
 export * from "./get-value-from-text-node";
-export * from "./isa";
 export * from "./lazy-json";
 export * from "./date-utils";
 export * from "./split-every";