feat: Send multiple files into a single message

[abhipatel0211]

Proposed changes (including videos or screenshots)

Changes

1. Multiple file sharing in one message.
2. Multiple file sharing in one message in E2E encrypted rooms.
3. Functionality of adding and removing files in FileUploadModal.
4. Updated API endpoints rooms.media/:rid and rooms.mediaConfirm/:rid/:fileId to handle multiple files.

Steps to test or reproduce

1. Go to a room.
2. Try sharing multiple files.
3. Confirm file selected.
4. Use the FileUploadModal to add and remove files.

Further comments

This implementation is an initial version of the multiple file sharing feature. While it is functional, some minor bugs remain, particularly with image file sharing, which will be addressed in future updates.

CORE-847

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This pull request introduces the ability to send multiple files in a single message within the Rocket.Chat application. Key changes include:

• File Upload Enhancements: The file upload functionality has been significantly refactored to support multiple files, including updates to the UploadsAPI interface with new methods for managing uploads and handling encrypted content. The Upload type definition now includes both file and URL properties.

• New Components and Hooks: Several new components and hooks have been added to manage file uploads, such as MessageComposerFile, MessageComposerFileArea, and MessageComposerFileLoader, which provide UI elements for file management, preview, and error handling. The useFileUploadDropTarget hook has been introduced to streamline file upload handling.

• Thread and Message Integration: The PR adds support for thread-specific uploads and integrates file upload capabilities into various components like MessageBox, AudioMessageRecorder, and VideoMessageRecorder. The confirmFiles function is introduced to handle file confirmation and sending, with error handling and cleanup processes.

• Localization and API Updates: The English localization file has been updated with new messages related to upload failures and file count limitations. A new API endpoint for media editing has been added to the REST typings.

Overall, this pull request enhances the file upload experience by allowing multiple files to be sent in a single message, improving the user interface, and refining the underlying upload logic.

[pierre-lehnen-rc]

Early in my tests of it, but I've already found a few bugs:

1. The rooms.images endpoint is being called multiple times when I click on an image attachment. If I click on 3 attachments it's already enough to get the next request blocked by the rate limiter, which causes a weird error popup to show up instead of the image.
2. If I try to upload an invalid image (for example, a text file renamed to image.png), the composer will show ALL files flagged with "Upload failed", even though the other files were uploaded properly.
3. When viewing an image from a message, the arrows to jump to next/from image are inconsistent. Sometimes they are enabled, sometimes they aren't. I didn't find any pattern for it.

[dougfabris]

@pierre-lehnen-rc About item 2 I will investigate. Items 1 and 3 are not related to the change we're doing here!

FYI on item 3, you probably forgot but we do not store the position of an image so when we open the carousel it starts the load from the clicked image