README of JS Client still using v0.1.0

### What happened?

https://github.com/google-a2a/a2a-samples/tree/main/samples/js/src/client

Using types like TaskSendParams which are no longer available in v0.2.x.

### Relevant log output

```shell

```

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

The issue points to the README in the JS client directory. Check the current types in the v0.2.x release of the A2A protocol to see what replaced TaskSendParams. Update the README examples to use the correct types. Verify by looking at the source code or package.json in that directory to confirm the version.

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