[REQ][RUST] Allow structs generated by using the `useSingleRequestParameter` option to derive from `#[derive(Default)]`

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

First up, thank you very much for all the work done on the specification and making this incredibly complex topic even possible to begin with

As mentioned in #24312 in the Alternatives section structs generated with the useSingleRequestParameter option do not currently derive from #[derive(Default)].

Using defaults, especially on structs with a large number of parameters has become a defacto standard for achieving similar to named parameter functionally in rust as mentioned in issues, thread or similar regarding the topic.

Describe the solution you'd like

Improving this would allow for something likes this:

struct someParams {
  some1: Option<String>,
  some2: Option<String>,
  some3: Option<String>,
  some4: Option<String>,
  some5: Option<String>,
  some6: Option<String>,
  some7: Option<String>,
  some8: Option<String>,
}

let tmp = someFn(someParams {
  some1: None, 
  some2: None, 
  some3: None, 
  some4: None, 
  some5: None, 
  some6: None,  
  some7: None, 
  some8: None
})

to turn into this:

#[derive(Default)]
struct someParams {
  some1: Option<String>,
  some2: Option<String>,
  some3: Option<String>,
  some4: Option<String>,
  some5: Option<String>,
  some6: Option<String>,
  some7: Option<String>,
  some8: Option<String>,
}

let tmp = someFn(someParams {some1: "smth",  some5: "smth", ..Default::default()})

Describe alternatives you've considered

using the useBonBuilder option as mentioned in #24312 & #24313

Additional context

std::Default
default example1
default example2

Start by tracing the Rust generator's useSingleRequestParameter option and the template or entry point that emits its structs. Compare the behavior with the useBonBuilder alternative referenced in #24312 and #24313. Done means generated structs include #[derive(Default)] and support the shown ..Default::default() usage, with generator tests covering it.