Move table to using arrow

[metalmatze]

This creates an arrow-based table that has full parity with the current table implementation.
Overall, this is just the start of the table improvements. There are some low-hanging fruits I want to follow up with after this.

We are now also showing Flat Diff and have the Cumulative Diff column be named that, rather than just Diff.

[alwaysmeticulous]

✅ Meticulous spotted zero visual differences across 241 screens tested: view results.

_{Last updated for commit da7d2be. This comment will update as new commits are pushed.}

[brancz]

Just a minor question, otherwise lgtm