Keep Retool customizable via JS escape hatches

@AnnaW,

to add another data point to @JoeyKarczewski 's post:

I just posted last week about an issue I had with the new table component taking away the ability to dyanimcally toggle between single/multi select.

Retool seeks to differetiate itself as a "developer tool", rather than a "low-code tool" but taking away these choices away from developers is a decision that aligns it more with the latter than the former.