Parse outer attributes on StructPatternEtCetera

[Veykril]

We do not currently parse the following snippet:

struct Foo { x: u32 }

let Foo { #[cfg(any())] .. };

This requires a change in the ungrammar file here https://github.com/rust-analyzer/ungrammar/blob/222f4d2891459e37b358930a0e608fdf5eed6da0/rust.ungram#L611-L615 and then a parsing change here https://github.com/rust-analyzer/rust-analyzer/blob/70fe7a4515ebdc6222a6565cd4cd1c5fd0c77350/crates/parser/src/grammar/patterns.rs#L206

[matklad]

@Veykril don't forget the E-has-instructions tag -- imo, that's the most imapctful one for new contributors

[bjorn3]

The example should have been let Foo { #[cfg(any())] .. };, right?

[Veykril]

Oh ye that was meant to be an attribute on .., I typoed that