chore(config): curl mode as config key

[mablr]

Motivation

Close #13252

Solution

• Provide --curl consistently in all subcommands
• Simplified helpers for provider instantiation using config
• Adjusted the signing_provider_with_curl function to get_provider_with_wallet for consistency.

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes (always consider --curl, no more implicit ignore)

[onbjerg]

i dont want this as a config key, idt it makes sense to configure this overall. can we fix this in another way?

[mablr]

@onbjerg I see your point.

My goal was primarily to fix inconsistent handling of the --curl flag and secondarily to simplify logic before doing #13259.

Can we fix this in another way?
Another clean approach could consist of:

• Remove curl from RpcOpts
• Introduce CurlRpcOpts
• Use CurlRpcOpts instead of RpcOpts for all subcommands to which we want to provide the --curl flag

#[derive(Clone, Debug, Default, Parser)]
#[command(next_help_heading = "Rpc options")]
pub struct CurlRpcOpts {
    /// RPC options
    #[command(flatten)]
    pub url: RpcOpts,

    /// Print the equivalent curl command instead of making the RPC request.
    #[arg(long)]
    pub curl: bool,
}

If you're okay with this proposition , i'll do first #13259 and then go back to this PR (as it's not anymore on my critical path)