[FEATURE] Support connector retry policy for streaming requests

[jiapingzeng]

Is your feature request related to a problem?
At the moment, Streaming requests do not apply connector retry configurations. This is because in RemoteConnectorExecutor, when a retry policy is configured, invokeRemoteServiceWithRetry (non-streaming handler) will be invoked even for stream requests, causing stream to freeze.

In a past PR, we have switched the order of the if statements so that stream evaluation is performed first, ensuring that stream requests get handled correctly when retry policy is configured. However, this means stream requests do not get retried.

What solution would you like?
We should also support retry policy for stream requests.

[amazon-q-developer]

✅ I finished the proposed code changes, and the pull request is ready for review: #2.

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