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Make DeserializationStrategy covariant at declaration-site (Kotlin#1897)
The type parameter T of DeserializationStrategy only appears in an out position, namely as the return type of deserialize(). It can therefore be annotated with `out` to increase API flexibility compared to DeserializationStrategy being invariant. E.g. a function taking DeserializationStrategy<Number> will now also accept an object of type DeserializationStrategy<Int>. This also results in DeserializationStrategy being more similar to the symmetric SerializationStrategy interface which is already contravariant at declaration-site (interface SerializationStrategy<in T>): SerializationStrategy is a consumer, and DeserializationStrategy is a producer. This change is * binary backward compatible: generics are erased at runtime * source backward compatible: previously specified out projections (use-site covariance) will only report a warning about a redundant projection
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