Implement non-deprecated API's of Coercing

[lenin-jaganathan]

Currently, all the extended scalars implementing Coercing implement the deprecated apis with only one method parameter. The Scalars can be updated to implement the non-deprecated methods of Coercing.

[Bitbot25]

This is not a huge problem for me because most of this is hidden away inside the library and does not cause issues outside of maintaining it. One thing that bothers me though, is that AliasedScalar also uses the deprecated APIs. Wrapping your custom scalar type in AliasedScalar causes it to call the deprecated serialize method which throws an exception by default. GraphQL-java explicitly advises against implementing the deprecated methods, not only using them.

[bbakerman]

Done in #159