Chore: Convert ObjectField to function components

[heath-freenome]

Reasons for making this change

The work to convert ObjectField to stateless functional components with some optimizations

• In @rjsf/utils:
  • BREAKING CHANGE: Updated FieldTemplateProps and WrapIfAdditionalTemplateProps to replace the onKeyChange() and onDropPropertyClick() callback generator props with the onKeyRename(), onKeyRenameBlur() and onRemoveProperty() callback props
  • BREAKING CHANGE: Updated ObjectFieldTemplateProps to replace the onAddClick() callback generator prop with the onAddProperty() callback prop
  • Added new hook useDeepCompareMemo() and its associated tests
• In @rjsf/core:
  • Updated ObjectField to refactor the code from a class component to two stateless functional components, replacing the 3 generator-props with the 4 memoized props mentioned in the @rjsf/utils changes
  • Updated Form to "memoize" the fieldPathId and registry into the FormState, adding a toIChangeEvent() helper to restrict the state returned on the IChangeEvent interface callbacks
  • Updated FieldTemplate, ObjectFieldTemplate and WrapIfAdditionalTemplate to rename the old additionalProperties interface props to the new ones
• In the rest of the themes, updated FieldTemplate, ObjectFieldTemplate and WrapIfAdditionalTemplate to rename the old additionalProperties interface props to the new ones
• Updated the custom-templates.md documentation to reflect the additionalProperties-based interface props replacement
• Updated the utility-functions.mf documenation to add the new useDeepCompareMemo() hook
• Updated the v6.x upgrade guide.md documentation to add the BREAKING CHANGES to the FieldTemplateProps, ObjectFieldTemplateProps and WrapIfAdditionalTemplateProps interface props changes and the useDeepCompareMemo() hook
• Updated the CHANGELOG.md accordingly

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests. I've run npx nx run-many --target=build --exclude=@rjsf/docs && npm run test:update to update snapshots, if needed.
  • I've updated docs if needed
  • I've updated the changelog with a description of the PR
• I'm adding a new feature
  • I've updated the playground with an example use of the feature