Support jump to the definition of auto-generated source?

[jmjoy]

Sometime we use build.rs to generate rust source, like bindgen, and then include the source by macro include.

For example:

include!(concat!(env!("OUT_DIR"), "/binding.rs"));

Imagine there is a function defined in binding.rs, and use in another mod, then operate the go to the definition.

Rust-analyzer will jump to the line include!(concat!(env!("OUT_DIR"), "/binding.rs"));,

Clion with rust plugin will jump to real line in binding.rs.

I think is better to act like Clion, is more convenient.

[jonas-schievink]

Duplicate of #3767