feat: ✨ Two styles for the columns block to enable multi-row, equal-height columns

[knice]

What does this do/fix?

This is primarily for repetitive, similar content blocks to neatly display multiple items across rows using a single columns block.

QA

Screenshots/video:

• Video explanation

Tests

Does this have tests?

• [ ] Yes
• [x] No, this doesn't need tests because...
• [ ] No, I need help figuring out how to write the tests.