RUST-1243 Handle enum keys when deserializing a map from binary #348
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RUST-1243
Prior to this PR, all keys were treated as strings, so the deserialization would fail with "invalid type: string "Key", expected enum Enum". This bug doesn't occur when deserializing from the parsed Bson types because that one uses the main deserializer to parse the key (which knows how to handle enum values) rather than a specialized one.