parsable interface needs to be splat in ruby

[baywet]

follow up of #737 and associated pull request for ruby

TODO:

• move the additional data property from Parsable interface to a new additional property holder interface in abstractions
• update the ruby refiner to replace that type reference when needed
• update the serialization JSON implementation (parse node) to leverage AdditionalDataHolder instead of parsable (in cast of casts) (not needed in ruby)

[baywet]

Example for refiner changes

kiota/src/Kiota.Builder/Refiners/JavaRefiner.cs

Line 168 in 5050e5d

private static void CorrectImplements(ProprietableBlockDeclaration block) {

kiota/src/Kiota.Builder/Refiners/JavaRefiner.cs

Line 106 in 5050e5d

new (x => x is CodeClass @class && @class.IsOfKind(CodeClassKind.Model) && @class.Properties.Any(x => x.IsOfKind(CodePropertyKind.AdditionalData)),