property wrappers

[tanner0101]

Updates FluentKit's model API to take advantage of property wrappers:

final class Planet: Model {
    @Field var id: Int?
    @Field var name: String
    @Parent var galaxy: Galaxy

    init() { }

    init(id: Int? = nil, name: String, galaxyID: Galaxy.ID) {
        self.id = id
        self.name = name
        self.$galaxy.id = galaxyID
    }
}

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