Add move_index to change the position of an entry #1
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This moves the position of a key-value pair from one index to another by shifting all other pairs in-between, making this an O(n) operation. This could be used as a building-block for other operations, like indexmap-rs#173 which wants to insert at a particular index. You can `insert_full` to insert it _somewhere_, then choose whether to `move_index` depending on whether you want to also change pre-existing entries.
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