map: fix map.clone, refactor, fix map_get_1, map_set_1 non-string keys #7538
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I've split out some work from #7503 in case it is decided not to merge it. It was already reviewed there.
Fix map.clone to clone keys too.
Move DenseArray.clone_key to map method as it will need key metadata for non-string keys.
Change DenseArray.push to only make space, not clone key.
Don't assume string key for map_get_1, map_set_1.