[REQ] [Rust] Add support for `native-tls` and `rustls-tls` Cargo features for the `reqwest` library

Is your feature request related to a problem? Please describe.

The Rust client SDK generator has 3 Cargo feature related problems:

1. The Cargo feature to chose between native-tls and rustls-tls is not made available for the reqwest library (only the reqwest-trait library). As a result, a transitive dependency to openssl-sys is pulled. Which is not suitable for some targets.
2. The feature naming is inconsistent with the rest of the ecosystem: the rustls feature should be called rustls-tls.

Describe the solution you'd like

reqwest = { version = "^0.12", default-features = false, features = ["json", "multipart"] }

[features]
default = ["native-tls"]
native-tls = ["reqwest/native-tls"]
rustls = ["reqwest/rustls-tls"]

Describe alternatives you've considered

Overriding Cargo.mustache works. But I'm sure I'm not the only one with this problem.

Additional context

I will open a PR.

Start in the Rust client SDK generator and inspect Cargo.mustache, especially the reqwest and reqwest-trait feature definitions. Generate a Rust client and compare the resulting Cargo.toml with the requested feature mappings. Done means native-tls and rustls-tls can be selected for reqwest without an unwanted openssl-sys dependency.