Improve UX for new row with NOT NULL constraint

[seancolsen]

Fixes #775
Fixes #1362

Demo

https://www.loom.com/share/b8da99a10eec4719b71c4ade93102c85

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[seancolsen]

Ok, the E2E test failure here is actually a good catch. Thanks, Playwright! I need to spend some more time on this, so I'm sending it back to draft state.

[seancolsen]

I pushed another commit to fix the bug that the E2E test caught. It brought to light an interesting edge case which warrants its own demo. Please also watch this video when reviewing:

https://www.loom.com/share/fd29aae20abf4877bb7f62e433cfaf8d

[pavish]

@seancolsen Nice work on this!

I tested a few scenarios and the UX looks good to me. There are some scenarios that are okay with me but I'm not sure on how the target users might perceive it.

For eg., For checkbox, when DEFAULT is displayed and the user clicks on the cell, it toggles the value and the checkbox is then displayed. This seems reasonable to me, but this is one of the areas where we should try to get the user's opinions when possible after the alpha.