Issue #2896722 by Sam152, Wim Leers, tim.plunkett, larowlan, timmillwood: Leverage PluginWithFormsInterface to encapsulate @WorkflowType schema and clean up state/transition form methods

Issue #2843083 by timmillwood, Manuel Garcia, Sam152, naveenvalecha, amateescu, yoroy, Gábor Hojtsy, xjm, jojototh, Bojhan, lauriii: Select entity type / bundle in workflow settings

Issue #2779647 by alexpott, Sam152, catch, scookie, yoroy, pericxc, timmillwood, tacituseu, jhedstrom, xjm, bojanz, tstoeckler: Add a workflow component, ui module, and implement it in content moderation

Issue #2725533 by timmillwood, alexpott, amateescu, webchick, dixon_, larowlan, dawehner, catch, Crell, Bojhan, jibran, Wim Leers, agentrickard, Berdir: Add experimental content_moderation module