Issue #3499550: Support server side validation and massage of prop values

Closes #3499550

Remaining tasks:

• Fix media library test
• Remove duplicate ErrorShape ts definition
• Add openapi spec for patch component
• Add kernel tests for patch component
• Add todo and issue for renaming initialized to 'updatePreview'
• Try to do away with PreviewController::clientLayoutAndModelToXbField
• Revert the todo change for ::findTargetForProps
• Try to patch component from main.tsx after ajax instead of using event listener - added a todo to #3505039 - still not sure its a great idea
• Add loading indicator to preview when patching component
• Remove updateNodeModel and updateNodeModelForce
• Split out issue for dead publish one code
• Fix empty layout error on passing object instead of array
• Fix naming of componentId in patchComponent, should be componentInstance
• Merge ApiLayout and ApiPreview controllers
• Handle 422 errors in patchComponent - added a todo to #3505018