Upgrade RN Storybook/addons/deps from v5.3 to v6.0.1-alpha.7/v6.4.1

Prompted by Dependabot false positive Security vulnerabilities of dev build tools

RN Storybook v5.3
- Remove old /storybook config
- Keep old /stories for now

RN Storybook v6
- Setup in .storybook for now
- Add minimal config w/o stories for now

Jest setup mocks
- Remove stale RN mocks
- Add new RN Storybook mocks
- Doc @storybook/addon-ondevice-notes/register parsing issue
- Doc @storybook/addon-actions ES forEach proto parsing issue

Metro
- Config resolver for modern storybook build, vs polyfilled versions
- Keep inlineRequires optimisation on, disable later if blocking

App
- Update gitignore with Storybook
- Update app Storybook require to import with new path
- Add react-native-slider and RNDateTimePicker pods
- Add get-stories script to codegen storybook.requires.js
- Update RNCAsyncStorage pod
- Remove deprecated @react-native-community/async-storage later and update Reactotron config

Relevant Dependabot Security alerts
- Upgrading Storybook should clear some, resolve remaining after
- browserslist: storybookjs/storybook#15173
- glob-parent : storybookjs/storybook#15174
- Vulnerabilities: storybookjs/storybook#16063
- immer: storybookjs/storybook#16093
- immer: storybookjs/storybook#16556

storybookjs/react-native#240
- Old v5.3 warnings no longer present, in this v6 no-stories but with addons upgrade so far

.gitignore

@@ -80,3 +80,6 @@ buck-out/
 !.yarn/releases
 !.yarn/sdks
 !.yarn/versions
+
+# Storybook
+storybook.requires.js

.storybook/Storybook.tsx

@@ -0,0 +1,7 @@
+import { getStorybookUI } from '@storybook/react-native'
+
+import './storybook.requires'
+
+const StorybookUIRoot = getStorybookUI({})
+
+export default StorybookUIRoot

.storybook/main.js

@@ -0,0 +1,10 @@
+// TODO: .ts
+module.exports = {
+  stories: [],
+  addons: [
+    '@storybook/addon-ondevice-actions',
+    '@storybook/addon-ondevice-backgrounds',
+    '@storybook/addon-ondevice-controls',
+    '@storybook/addon-ondevice-notes' // https://github.com/storybookjs/react-native/issues/24#issuecomment-615934280
+  ]
+}

.storybook/preview.js

@@ -0,0 +1,24 @@
+// TODO: .ts
+import { View, StyleSheet } from 'react-native'
+import { withBackgrounds } from '@storybook/addon-ondevice-backgrounds'
+
+export const decorators = [
+  StoryFn => (
+    <View style={styles.container}>
+      <StoryFn />
+    </View>
+  ),
+  withBackgrounds
+]
+export const parameters = {
+  some_param: 'some value',
+  backgrounds: [
+    { name: 'plain', value: 'white', default: true },
+    { name: 'warm', value: 'hotpink' },
+    { name: 'cool', value: 'deepskyblue' }
+  ]
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, padding: 8 }
+})