Add params schema support to ProcessNode and align legacy _from_scriptconfig#7

Erotemic wants to merge 4 commits intomainAIQ-Kitware/kwdagger:mainfrom

codex/add-params-class-variable-to-processnodeAIQ-Kitware/kwdagger:codex/add-params-class-variable-to-processnodeCopy head branch name to clipboard