"for_packages" not populated for Rust package resources

[chinyeungli]

I ran a scan_single_package pipeline with pkg:cargo/syn@2.0.117. It correctly returned one detected package. However, none of the corresponding source files in the output include a for_packages value. Only Cargo.toml and Cargo.lock contain a for_packages entry.

The file "Cargo.toml" has the "include" list section that could be used to populate the "for_packages"
e.g.

[package]
edition = "2021"
rust-version = "1.71"
name = "syn"
version = "2.0.117"
authors = ["David Tolnay <dtolnay@gmail.com>"]
build = false
include = [
    "/benches/**",
    "/Cargo.toml",
    "/LICENSE-APACHE",
    "/LICENSE-MIT",
    "/README.md",
    "/src/**",
    "/tests/**",
]

[AyanSinhaMahapatra]

Thanks for the report @chinyeungli, moved this here at scancode-toolkit as this is where the fix needs to be implemented.