feat: Client pool interns keys #204
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By replacing most direct uses of connection keys with an opaque token, many client types no longer require the generic argument for the key type, greatly simplifying the implementation. Connection pool keys are converted to opaque, copyable tokens when checkouts are created from the pool, with keys that hash equivalently returning the same token. Then the pool uses these tokens in place of the keys in internal data structures.
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By replacing most direct uses of connection keys with an opaque token, many client types no longer require the generic argument for the key type, greatly simplifying the implementation.
Connection pool keys are converted to opaque, copyable tokens when checkouts are created from the pool, with keys that hash equivalently returning the same token. Then the pool uses these tokens in place of the keys in internal data structures.