feat: add availability zone awareness for standalone client

[nesty92]

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[nesty92]

@rueian, would love to get your thoughts on this PR.

Quick question: should we also be updating the nodes when the redirect is active? Not 100% sure on that part.

[rueian]

Hi @nesty92, thanks for the PR. Would you mind splitting the helpers to another PR? And the index 0 of the node slice may not be the primary if the user uses ReplicaSelector instead of ReadNodeSelector. I am also wondering if the helpers can be optimized with bit operations to avoid the second round of zone string comparison.