Fix: made small changes to utility functions to fix #3997, #4314 and #4322

[heath-freenome]

Reasons for making this change

Fixes #3977, #4314, #4322

• In @rjsf/utils, made the following changes:
  • Added mergeDefaultsIntoFormData option to Experimental_DefaultFormStateBehavior type to control how to handle merging of defaults
  • Updated mergeDefaultsWithFormData() to add new optional defaultSupercedesUndefined that when true uses the defaults rather than undefined formData
  • Updated getDefaultFormState() to pass true to mergeDefaultsWithFormData for defaultSupercedesUndefined when mergeDefaultsIntoFormData has the value useDefaultIfFormDataUndefined
  • Updated getClosestMatchingOption() to improve the scoring function so that an object container that matches a key gets an extra point
• In @rjsf/core, updated MultiSchemaField to call onChange after setting the new option in state rather than before
• In the playground, added controls for the new mergeDefaultsIntoFormData option
  • Moved the Show Error List component over one column, making it inline radio buttons rather than a select
• 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

[reshmarevi-kv]

please merge this pr fast

[heath-freenome]

please merge this pr fast

I am having to deal with a regression that was detected in testing and my job is quite busy. Working as fast as I can, sorry

[heath-freenome]

Ok, in order to avoid regressions, I added a new, optional mergeDefaultsIntoFormData prop to Experimental_DefaultFormStateBehavior which can be used to fix the issue seen in #4322