[Feature] Add Http::new for reqwest::Client

[mattsse]

Component

rpc

Describe the feature you would like

the most commonly used http transport is reqwest::Client, currently it's required to provide the type:

let http = Http::<Client>::new(url);

this requires to always pull in reqwest.

I think it would be reasonable to move the new function to impl Http<reqwest::Client>, there is already Http::with_client that is sufficient for all other use cases.

Additional context

No response

[nkysg]

I can try this.