This change updates the prefix filter to implement the TrackableFilter
interface. This provides the functionality for the user to track which
fields were updated by the prefix filter.
* Refactor prefix filter into its own filter, decoupled from the prefixsuffix filter
* Refactor prefix transformer into its own transformer, decoupled from the prefixsuffix transformer
* Refactor suffix filter into its own filter, decoupled from the prefixsuffix filter
* Refactor suffix transformer into its own transformer, decoupled from the prefixsuffix transformer
* Add a default nameSuffix field spec in addition to the namePrefix
* Remove the PrefixSuffixTransformer from the list of builtin transformers
* Add a multi-transformer to builtinhelpers.TransformFactories
* Remove the implementation of the prefixsuffixtransformer.PrefixSuffixTransformer
* Resolve style and format related feedback from the pull request
* Add test to test the legacy PrefixSuffixTransformer for BC purposes
