feat(data): add publish events over WebSocket

[zxl629]

Description of changes

Add support to publish events over WebSocket connection for Amplify events client. Customers can now perform the following operations to publish their events.

// WSS Connect 
const channel = await events.connect("test/events");

// WSS publish events
await channel.publish(
      { key: "my event content" },
      { authMode: "identityPool" }
);

// WSS publish events batch
await channel.publish([1, 2, 3], { authMode: "identityPool" });

Description of how you validated changes

• Manual testing with a sample app
• E2Es: https://github.com/aws-amplify/amplify-js/actions/runs/13510524961
• Unit test added/ passed

Checklist

• PR description included
• yarn test passes
• Unit Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

Checklist for repo maintainers

• Verify E2E tests for existing workflows are working as expected or add E2E tests for newly added workflows

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.