wip: bg downloader module

modules/background-downloader/src/BackgroundDownloader.types.ts

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+export interface DownloadProgressEvent {
+  taskId: number;
+  bytesWritten: number;
+  totalBytes: number;
+  progress: number;
+}
+
+export interface DownloadCompleteEvent {
+  taskId: number;
+  filePath: string;
+  url: string;
+}
+
+export interface DownloadErrorEvent {
+  taskId: number;
+  error: string;
+}
+
+export interface DownloadStartedEvent {
+  taskId: number;
+  url: string;
+}
+
+export interface ActiveDownload {
+  taskId: number;
+  url: string;
+  state: "running" | "suspended" | "canceling" | "completed" | "unknown";
+}
+
+export interface BackgroundDownloaderModuleType {
+  startDownload(url: string, destinationPath?: string): Promise<number>;
+  cancelDownload(taskId: number): void;
+  cancelAllDownloads(): void;
+  getActiveDownloads(): Promise<ActiveDownload[]>;
+}

modules/background-downloader/src/BackgroundDownloaderModule.ts

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+import { requireNativeModule } from "expo-modules-core";
+import type { BackgroundDownloaderModuleType } from "./BackgroundDownloader.types";
+
+const BackgroundDownloaderModule: BackgroundDownloaderModuleType =
+  requireNativeModule("BackgroundDownloader");
+
+export default BackgroundDownloaderModule;