Upload image in composer (#27)

* upload images in composer v1

* fix android compile

* reafctor image carousel into new component;
fix photo overlapping text in composer

* revert android changes

* further refactoring code into different components

* move show carousel out of the component

* fixing add photo using camera

* fix typescript issue; force mediatype photo

* change post test with photo attached;
remove auto linking settings

* use runInAction in getPhotos model

* react-hooks/exhaustive-deps fixes

* crop every photo;
make use of useCallback

* moving placeholder condition

* Cleanup

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

src/state/models/user-local-photos.ts

@@ -0,0 +1,27 @@
+import {PhotoIdentifier} from './../../../node_modules/@react-native-camera-roll/camera-roll/src/CameraRoll'
+import {makeAutoObservable, runInAction} from 'mobx'
+import {CameraRoll} from '@react-native-camera-roll/camera-roll'
+import {RootStoreModel} from './root-store'
+
+export class UserLocalPhotosModel {
+  // state
+  photos: PhotoIdentifier[] = []
+
+  constructor(public rootStore: RootStoreModel) {
+    makeAutoObservable(this, {
+      rootStore: false,
+    })
+  }
+
+  async setup() {
+    await this._getPhotos()
+  }
+
+  private async _getPhotos() {
+    CameraRoll.getPhotos({first: 20}).then(r => {
+      runInAction(() => {
+        this.photos = r.edges
+      })
+    })
+  }
+}