[RUST] Modular import defines the same struct multiple times in different files.

[Anatoly03]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce

Rust-generated Bebop code creates redundant struct definitions in dependent modules using import. Have a Point struct defined in general.bop and import it into request.bop. Using the build file in the documentation, it will generate the Point class in _::request::Point and _::general::Point (it also generates redundant structs of unused definitions)

Expected behavior

The Point struct should only be generated where it is defined and dependents should instead use-link the struct into the Rust file.

Screenshots / Snippets

// general.bop
struct Point {
    int32 x;
    int32 y;
}

// request.bop
import "./general.bop"

struct PlayerMoveRequest {
    Point position;
}

message Request {
    1 -> PlayerMoveRequest move;
}

Bebop info:

• Version: 3.0.14 and 3.1.3
• Runtime: Rust

Desktop (please complete the following information):

• OS: macOS-Ventura
• Version 13.7.6

[andrewmd5]

pinging @mattiekat who wrote the Rust generator, she will be able to provide better input than me.

Contributions are also welcome.