"Implement Missing Members" assist shouldn't ignore doc(hidden) methods

[poliorcetics]

rust-analyzer version: (eg. output of "rust-analyzer: Show RA Version" command, accessible in VSCode via Ctrl/⌘+Shift+P) rust-analyzer 0.0.0 (4586a6b26 2023-10-18)

rustc version: (eg. output of rustc -V) rustc 1.73.0 (cc66ad468 2023-10-03)

relevant settings: (eg. client settings, or environment variables like CARGO, RUSTC, RUSTUP_HOME or CARGO_HOME)

I'm trying to implement prost::Message for a type and using Implement Missing Members to generate the methods I need to actually write. It's missing the two doc(hidden) methods on the trait.

[alibektas]

@rustbot claim

[alibektas]

With #14957 we started skipping implementing items with #[doc(hidden)] attributes. But I guess you have a fair point. It'd better if we changed it to : "Skip if you see doc(hidden) and no default implementation"