parser: Restore `Map` struct

In 13e90c090923a209e5e26fb3e609d5d12f737f53 I decided to make `Map` a
type alias to a tuple containing the key-value pair used by
`MapCollection`.

Here I've decided that I prefer the type as it was before. Sure, it was
more of an intermediary type, but it did have a name that was used
consistently. We do have to leave in our custom `HashMap` building, so
perhaps this isn't the ideal solution, but I'm going with it, at least
for now.

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