feat: global upload manager to track file uploads outside of AttachmentManager

[szuperaz]

CLA

• I have signed the Stream CLA (required).
• Code changes are tested

Description of the changes, What, Why and How?

RN PR for reference: GetStream/stream-chat-react-native#3527

React Native allows hitting the send button before attachment uploads are completed. This means they need a way to track attachment upload status outside of AttachmentManager.

To solve this we have an UploadManager (can be accessed via client.uploadManager) that uses the AttachmentManager of a given channel to do attachment upload, and has a state to track uploadProgress for attachments.

Attachments are tracked by id in UploadManager.

Long-term solution: we talked with @isekovanic that messageComposer should have support for this feature, but that is a bigger task, not the scope of this PR.

Changelog

[github-actions]

Size Change: +3.47 kB (+0.94%)

Total Size: 374 kB

📦 View Changed

Filename	Size	Change
dist/cjs/index.browser.js	125 kB	+1.16 kB (+0.94%)
dist/cjs/index.node.js	126 kB	+1.16 kB (+0.93%)
dist/esm/index.mjs	124 kB	+1.15 kB (+0.94%)

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