Generate structs with x/tools fieldalignment suggested ordering

[natethinks]

x/tools fieldalignment -fix will reorder your structs to decrease memory usage and garbage collection. I propose the fieldallignment order be used in the structs generated by sqlc. This can be run manually with no side effects as far as I can tell, but you'll have to run it again every time you generate the code.

[kevinburke]

I think you'd want to trade this off with the readability of having e.g. the important fields in a database model listed first, or consecutively. In practice maybe it doesn't matter because the fields are not moving around that much.

[natethinks]

That's fair. Although I'm not sure how much I value readability in generated code. I don't really care what the the generated structs look like as long as they accurately represent my DB table structure.

[ksthiele]

+1 it could save a good amount of memory, even if its just optional

https://medium.com/@felipedutratine/how-to-organize-the-go-struct-in-order-to-save-memory-c78afcf59ec2