feat: add GetDnsRecordAsync method to CloudflareService

src/CloudflareDnsync.Services/CloudflareService.cs

@@ -56,6 +56,15 @@ public Task<CloudflareResponse<List<DnsRecord>>> GetDnsRecordsAsync(
             $"zones/{zoneId}/dns_records?page={page}&per_page={perPage}&type=A",
             cancellationToken: cancellationToken);
 
+    public Task<CloudflareResponse<DnsRecord>> GetDnsRecordAsync(
+        string zoneId,
+        string recordId,
+        CancellationToken cancellationToken = default)
+        => SendAsync<CloudflareResponse<DnsRecord>>(
+            HttpMethod.Get,
+            $"zones/{zoneId}/dns_records/{recordId}",
+            cancellationToken: cancellationToken);
+
     public Task<CloudflareResponse<DnsRecord>> UpdateDnsRecordAsync(
         string zoneId,
         string recordId,

src/CloudflareDnsync.Services/ICloudflareService.cs

@@ -50,6 +50,21 @@ Task<CloudflareResponse<List<DnsRecord>>> GetDnsRecordsAsync(
         int perPage = 20,
         CancellationToken cancellationToken = default);
 
+    /// <summary>
+    /// Retrieves a DNS record for a zone from Cloudflare.
+    /// </summary>
+    /// <param name="zoneId">The ID of the dns record's zone.</param>
+    /// <param name="recordId">The ID of the dns record.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>
+    /// A task that represents the asynchronous operation.
+    /// The task result contains the Cloudflare response containing the DNS record.
+    /// </returns>
+    Task<CloudflareResponse<DnsRecord>> GetDnsRecordAsync(
+        string zoneId,
+        string recordId,
+        CancellationToken cancellationToken = default);
+
     /// <summary>
     /// Updates a DNS record for a zone in Cloudflare.
     /// </summary>