support detailed markdown diff

[gerrycampion]

For Published rules testing, this improves the reporting of failed tests in the detailed report.

• Uses markdown table to display differences
• Aligns differences using closest row match instead of strictly row number
• Uploads both the expected and actual results to artifacts instead of only the expected results

Action run before update: https://github.com/cdisc-org/cdisc-rules-engine/actions/runs/27967250482
Action run after update: https://github.com/cdisc-org/cdisc-rules-engine/actions/runs/27973685763

Requires PR: cdisc-org/cdisc-open-rules#57