Re-introduce object param parsing

[maciejhirsz]

Fixes #445.

The trick is that instead of putting fn argument types (which may be generic) on the struct like it used to, e.g.:

#[derive(jsonrpsee :: types :: __reexports :: serde :: Deserialize)]
#[serde(crate = "jsonrpsee :: types :: __reexports :: serde")]
struct ParamsObject {
    gun: Gun,
    map: HashMap<u8, u8>,
}
let parsed: ParamsObject = params.parse()?;

We make a struct that's entirely generic, so that all types are always used in scope where they belong:

#[derive(jsonrpsee :: types :: __reexports :: serde :: Deserialize)]
#[serde(crate = "jsonrpsee :: types :: __reexports :: serde")]
struct ParamsObject<G0, G1> {
    gun: G0,
    map: G1,
}
let parsed: ParamsObject<Gun, HashMap<u8, u8>> = params.parse()?;

As a bonus this removes the need to inject lifetimes into references (no need to transform &str into &'a str etc.), so that whole thing can be removed.

[niklasad1]

👍 , nice your wizard

[dvdplm]

As a bonus this removes the need to inject lifetimes into references (no need to transform &str into &'a str etc.), so that whole thing can be removed.

That is … magic!