feat: begin working on Onspring worker

src/SanctionsSearch.Worker/Workers/OnspringWorker.cs

@@ -0,0 +1,51 @@
+
+namespace SanctionsSearch.Worker.Workers;
+
+public class OnspringWorker(
+  ILogger<OnspringWorker> logger,
+  TimeProvider timeProvider,
+  IServiceScopeFactory serviceScopeFactory
+) : IHostedService, IDisposable
+{
+  private readonly ILogger<OnspringWorker> _logger = logger;
+  private readonly TimeProvider _timeProvider = timeProvider;
+  private readonly IServiceScopeFactory _serviceScopeFactory = serviceScopeFactory;
+  private ITimer? _timer;
+
+  public Task StartAsync(CancellationToken cancellationToken)
+  {
+    _logger.LogInformation("Onspring worker started");
+
+    _timer = _timeProvider.CreateTimer(
+      callback: async _ => await RunSearchRequests(),
+      state: null,
+      dueTime: TimeSpan.Zero,
+      period: TimeSpan.FromMinutes(1)
+    );
+
+    return Task.CompletedTask;
+  }
+
+  public Task StopAsync(CancellationToken cancellationToken)
+  {
+    _logger.LogInformation("Onspring worker stopped");
+
+    _timer?.Change(Timeout.InfiniteTimeSpan, TimeSpan.Zero);
+
+    return Task.CompletedTask;
+  }
+
+  public void Dispose()
+  {
+    _timer?.Dispose();
+
+    GC.SuppressFinalize(this);
+  }
+
+  private Task RunSearchRequests()
+  {
+    _logger.LogInformation("Running search requests");
+
+    return Task.CompletedTask;
+  }
+}