* add v1alpha2 registry based conversion
* test defaults, set our 1st explicit default
* fix typos and dates
* move pluginregistry to its own dir
* remove unused v1alpha2.Namespace type
* move migration code folders, remove switch
* validate internalPolicy a single time
* remove structured logs
* simplify return
* check for nil methods
* properly check before adding default evictor
* add TODO comment
* bump copyright year
* use plugin registry and prepare for conersion
* Register plugins explicitly to a registry
* check interface impl instead of struc var
* setup plugins at top level
* treat plugin type combinations
* pass registry as arg of V1alpha1ToInternal
* move registry yet another level up
* check interface type separately
