Do not use DataSchemaNode in Anydata normalization

NormalizedAnydata and NormalizableAnydata rely on DataSchemaNode to provide enough context to decode the data. This is made with the implicit assumption that DataSchemaNode.getPath() provides the context needed to perform things like leafref resolution.

We have a better replacement in EffectiveStatementInference, which combines an EffectiveModelContext with an ordered list of EffectiveStatements – providing a simple-to-use alternative.