feature: Support raw validation in the playground

[heath-freenome]

Reasons for making this change

To help users determine whether validation issues are specific to Ajv or RJSF, a new raw validation feature was added to the playground

• Updated the ValidatorType interface to add the new rawValidation() function
• Refactored the validator-ajv6 and validator-ajv8 ValidatorType implementations to create the rawValidation() function
• Updated the Test validation implementations to implement the rawValidation() function
• Updated the playground's app.js to update the accidentally committed code to better display any validation errors

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 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