feat: Add OfacFileService

- Add initial OfacFileService including deps
- Added Moq and MockHttp as dependencies
  for testing

src/SanctionsSearch.Worker/Services/OfacFileService.cs

@@ -0,0 +1,29 @@
+namespace SanctionsSearch.Worker.Services;
+
+interface IOfacFileService
+{
+}
+
+class OfacFileService(
+  HttpClient client,
+  ILogger<OfacFileService> logger,
+  IOptionsSnapshot<OfacFileServiceOptions> options
+) : IOfacFileService
+{
+  private readonly HttpClient _client = client ?? throw new ArgumentNullException(nameof(client));
+  private readonly ILogger<OfacFileService> _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+  private readonly OfacFileServiceOptions _options = options?.Value ?? throw new ArgumentNullException(nameof(options));
+}
+
+class OfacFileServiceOptions
+{
+  public string Url { get; set; } = string.Empty;
+  public string SdnFileName { get; set; } = string.Empty;
+  public string AddressFileName { get; set; } = string.Empty;
+  public string AltNamesFileName { get; set; } = string.Empty;
+  public string CommentsFileName { get; set; } = string.Empty;
+  public string ConPrimaryNameFileName { get; set; } = string.Empty;
+  public string ConAddressesFileName { get; set; } = string.Empty;
+  public string ConAltNamesFileName { get; set; } = string.Empty;
+  public string ConCommentsFileName { get; set; } = string.Empty;
+}