feat: add attachment manager middleware for pre-upload and post-upload events

[MartinCupela]

Goal

Allow integrators to customize the pre-upload and post-upload logic for attachments.

chatClient.setMessageComposerSetupFunction(({ composer }) => {
      ...
      composer.attachmentManager.preUploadMiddlewareExecutor.insert({
        middleware: [createCustomPreUploadMiddleware(composer)],
        position: {
          after: 'stream-io/attachment-manager-middleware/blocked-upload-notification',
        },
        unique: true,
      });

      composer.attachmentManager.postUploadMiddlewareExecutor.insert({
        middleware: [createCustomPostUploadMiddleware(composer)],
        position: {
          before: 'stream-io/attachment-manager-middleware/post-upload-enrichment',
        },
        unique: true,
      });
    });

Middleware handlers of the same eventName can now be executed concurrently. This is necessary to perform all the attachment uploads.

Details

• The upload config check has been moved to pre-upload middleware and thus can be replaced with custom upload config check for a CDN other than Stream's
• It is not necessary to provide a filter function (fileUploadFilter) as the filtering can take place inside the middleware
• The post upload middleware executor allows for handling upload errors, further attachment enrichment, notifications etc.

Deprecations

• AttachmentManager.fileUploadFilter() getter and setter - replaced with middleware handlers
• AttachmentManager.fileToLocalUploadAttachment(file) - replaced with static AttachmentManager.toLocalUploadAttachment(file)
• AttachmentManager.uploadAttachment(attachment) - replaced with AttachmentManager.uploadFile(file)

[github-actions]

Size Change: +3.59 kB (+0.81%)

Total Size: 445 kB

Filename	Size	Change
dist/cjs/index.browser.cjs	129 kB	+1.18 kB (+0.92%)
dist/cjs/index.node.cjs	174 kB	+1.18 kB (+0.68%)
dist/esm/index.js	142 kB	+1.23 kB (+0.87%)

_{compressed-size-action}

[stream-ci-bot]

🎉 This PR is included in version 9.14.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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