TD-1855: Optional radio and checkbox item css

[OluwatobiAwe]

JIRA link

TD-1855

Description

Added optional CSS property to radiolist and checkboxes view components in other to even distribute child items horizontally in divs.
Added span with class="nhsuk-error-message" for validation error within the radiolist view component.

Screenshots

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Developer checks

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I have:

• Run the formatter and made sure there are no IDE errors (see info on Text Editor settings to avoid whitespace changes)
• Written tests for the changes (accessibility tests, unit tests for controller, data services, services, view models, etc)
• Manually tested my work with and without JavaScript
• Tested any Views or partials created or changed with Wave Chrome plugin and addressed any valid accessibility issues
• Updated/added documentation in Confluence and/or GitHub Readme. List of documentation links added/changed:
  • doc_1_here
• Updated my Jira ticket with information about other parts of the system that were touched as part of the MR and have to be sanity tested to ensure nothing’s broken
• Scanned over my pull request in GitHub and addressed any warnings from the GitHub Build and Test checks.