Add ability to toggle a collapsible section

[alxmrtn]

Feature Request

Provide an option to wrap the markdown table in a <details></details> tag to create a collapsible section in the markdown.

Expected Behaviour

• Setting something like setting collapsible to true in the parameters
• Keeps the badge outside of the collapsible section, so you can get a high level overview

Additional Context

Currently doing this

    - name: Add Coverage Report to Step Summary
      run: |
        echo "# Code Coverage Summary" >> $GITHUB_STEP_SUMMARY
        echo "<details><summary>Expand for details</summary>" >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY
        cat code-coverage-results.md >> $GITHUB_STEP_SUMMARY
        echo "" >> $GITHUB_STEP_SUMMARY
        echo "</details>" >> $GITHUB_STEP_SUMMARY

which isn't bad, but I'd love for the badge to be outside of the details section

[alxmrtn]

draft PR here: #369