Improve readyState behavior to more reliably report connection state

[alexbevi]

Prerequisites

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🚀 Feature Proposal

Since readyState updates are based on topology status updates, it's less reliable in stateless environments (such as AWS Lamba) as topology update events may be missed while the execution environment is frozen.

This can result in readyState tests returning stale state information.

Motivation

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Example

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[vkarpov15]

Going to move this one back because I've been having trouble reproducing this issue in AWS lambda