Add support for domain research endpoint

[juankuquintana]

Belongs to https://github.com/dnsimple/dnsimple-business/issues/2442
Fixes https://github.com/dnsimple/dnsimple-app/issues/33909

Add support for domain research endpoint

🔍 QA

1. Run cargo run --bin test_domain_research

use dnsimple::dnsimple::{new_client, Client};

fn main() {
    let account_id = 2u64;
    let domain = "example.com";
    let token = "dnsimpletest_a_FSYtfYn7p74jfPd3GBUUsnLoOXia8hkR";

    // Create client pointing to local API
    let mut client = new_client(false, String::from(token));
    client.set_base_url("http://api.localhost:5000");

    println!("Testing domain research for: {}", domain);

    match client.domains().domain_research_status(account_id, String::from(domain)) {
        Ok(response) => {
            if let Some(research) = response.data {
                println!("Request ID: {}", research.request_id);
                println!("Domain: {}", research.domain);
                println!("Availability: {}", research.availability);
                println!("Errors: {:?}", research.errors);
            } else {
                println!("Error: No data in response");
            }
        }
        Err(error) => {
            println!("Error: {:?}", error);
        }
    }
}

📋 Deployment Pre/Post tasks

• PRE: Domain research endpoint is released in production
• POST: Create a release version https://github.com/dnsimple/dnsimple-rust/blob/main/RELEASING.md

Deployment Verification

• QAd