Auto merge of #150603 - Kivooeo:tuple-struct, r=BoxyUwU

MGCA: Support for tuple constructors

r? BoxyUwU

part of rust-lang/rust#132980

fixes rust-lang/rust#136379
fixes rust-lang/rust#138132

i tried to keep implementation very minimal and it's very similar to how structs was implemented with small adjustments

this does not make const constructor like None works, just something like Some(n)

todo:
* ~~tests~~
* write a better description (not sure if needed)
* add more comments and FIXMEs from structs code

Author: bors