Use expo-image-picker on Web (#847)

src/lib/media/picker.shared.ts

@@ -0,0 +1,23 @@
+import {
+  ImagePickerOptions,
+  launchImageLibraryAsync,
+  MediaTypeOptions,
+} from 'expo-image-picker'
+import {getDataUriSize} from './util'
+
+export async function openPicker(opts?: ImagePickerOptions) {
+  const response = await launchImageLibraryAsync({
+    exif: false,
+    mediaTypes: MediaTypeOptions.Images,
+    quality: 1,
+    ...opts,
+  })
+
+  return (response.assets ?? []).map(image => ({
+    mime: 'image/jpeg',
+    height: image.height,
+    width: image.width,
+    path: image.uri,
+    size: getDataUriSize(image.uri),
+  }))
+}