Common StateHelper for all JSF StateHolder/PartialStateHolder

There should be a common StateHelper for all JSF "components" that can implement StateHolder/PartialStateHolder e.g. Behavior, Converter and Validator.

There could be a base class like UIComponentBase for this purpose for each type that exposes the StateHelper (e.g. something like ConverterBase). BehaviorBase should be extended to expose the helper.
#### Affected Versions
[2.2]

Start by reviewing the StateHolder and PartialStateHolder contracts, then compare UIComponentBase, BehaviorBase, Converter, and Validator as named in the issue. Determine whether a shared base such as ConverterBase is appropriate for each type and how BehaviorBase would expose StateHelper. Done requires an agreed design and implementation covering the affected component types.

Written by the indexing model from the issue text.