[ios] Sort candidate annotations by proximity to tap

If you tap near a tight cluster of annotations, the annotation directly beneath your finger should be selected first. Previously, the annotations within the query bounds would be selected in order from oldest to newest, which was counterintuitive. The new behavior does sometimes make it more difficult to cycle through the entire cluster, but the previous behavior often got in the way anyways, as your finger would wind up atop a callout view for an annotation farther south.

Also updated the changelog.

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