Ability to show quick action and add files to edit post (#8926)

* Viewing Files in Edit mode in mobile with ability to delete and save

* Added upload attachment to keyboard tracker view

* using state instread of use ref

* Minor

* Added tests

* intl extract

* new function getFiles
ById, batch file deletion and tests

* Files fetching in edit options and tests

* Removed DeviceEventEmitter and used React context

* Added support to check minimum required version to show edit file attachments

* resolve forward ref issue

* Minor

* memotized props for context and observe config with value

* Import fixes

* Ability to show quick action and add files to edit post

* type safety for EditPostContext

* Reverted back the post priority props

* constant shift

* Added test for QuickAction to show slashcomand

* Added test for edit_post, upload_item and upload_remove

* Added test for Edit_post_input and edit_post index

* fix the height issue between attachment and keyboard due to safeArea

* Minor: removed debugging border color

* Addressed dev review comments

* Import fixes

* Address UX comments

* Fixed props for UploadItem and remove effective Edit mode

* handled save button disabled state when uploading attachments

* handled newly added and retry file removal without alert message

* Test updated

* Added test for input_quick_action index.tsx

* Added test for not in edit mode for upload_item index

* Added test for upload_remove component when not in edit mode

* added tests for file_upload_error hook

* Added test for calling callback when in edit mode

* Test for edit post input for server version check

types/components/upload_error_handlers.ts

@@ -0,0 +1,6 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+export type ErrorHandlers = {
+    [clientId: string]: (() => void) | undefined;
+}