[REQ] [Rust] [Client] Add option to use rustls for reqwest instead of openssl

[skrcka]

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

Openssl tends to be problematic when crosscompiling. In some cases it's better to just go with rustls.

Describe the solution you'd like

New optional parameter that uses rustls feature instead of openssl for reqwest lib.

Describe alternatives you've considered

Additional context

[baszalmstra]

Ideally there would be features that allow selecting the default.

[aran]

Without something like this, it's tough to get rid of the openssl dependency if you have an openapi-generated crate in your project, and it it's also annoying to manage the openssl dependency. This is a burden for anyone consuming a modern rust openapi crate. It's also a new issue as of reqwest 0.12. If not an option, adding no-default-features to the reqwest dep would be helpful - then consuming crates could have more control.