[jdjioe5-cpu]

Summary

Closes #1153

This PR adds a default export (export default Client;) to the generated TypeScript client package in soroban-spec-typescript.

What Changed

• In cmd/crates/soroban-spec-typescript/src/lib.rs:
  • Appended export default Client; at the end of generate_class.
  • Added unit test test_generate_includes_export_default_client to verify that generate(...) includes export default Client;.
• Users can now import the generated client class via either:

  import HelloContract from "bindings/hello-soroban-client";

  or the existing named export:

  import { Client as HelloContract } from "bindings/hello-soroban-client";
  // or
  import * as HelloContract from "bindings/hello-soroban-client";

Testing

• Ran cargo test --package soroban-spec-typescript (all 26 tests passed).
• Ran cargo clippy --package soroban-spec-typescript --no-deps -- -D warnings.