fix(upload): fix download() locks main thread on Android

[velocitysystems]

Fixed:
#2593

Key Changes

• Add Upload demo to example project
• Add tests for upload method
• Use Tokio to spawn task when invoking download or upload command
• Fix bug where upload progress not properly reported from file_to_body function

Screenshots

[github-actions]

Package Changes Through 9549d50

There are 8 changes which include barcode-scanner with minor, barcode-scanner-js with minor, upload with patch, upload-js with patch, window-state with minor, window-state-js with minor, fs with patch, fs-js with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
api-example	2.0.30	2.0.31
api-example-js	2.0.26	2.0.27
barcode-scanner	2.3.0	2.4.0
barcode-scanner-js	2.3.0	2.4.0
fs	2.4.0	2.4.1
fs-js	2.4.0	2.4.1
dialog	2.3.0	2.3.1
dialog-js	2.3.0	2.3.1
http	2.5.0	2.5.1
http-js	2.5.0	2.5.1
persisted-scope	2.3.0	2.3.1
upload	2.3.0	2.3.1
upload-js	2.3.0	2.3.1
window-state	2.3.0	2.4.0
window-state-js	2.3.0	2.4.0

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[velocitysystems]

Tested upload demo on the following platforms:

• macOS
• Windows^
• Android (emulator)
• iOS (simulator)

Verified no locking of the main (UI) thread occurs when downloading or uploading.

^ When testing on Windows, I ran into the issues described in #2852. Switching to the Brownfield pattern in a local branch allowed me to test and validate the behavior was correct.

[velocitysystems]

@lucasfernog Fixed this issue.

FYI - I noticed mobile support isn't added in the example project; I had to manually run tauri ios init and tauri android init. Should this be included in another PR? I wasn't sure if there was a compelling reason why this isn't included.

[velocitysystems]

Added tests for upload method.

[FabianLars]

thanks for the pr just a nitpick annotated and we'll also need a changefile :) (check .changes dir for examples)

[velocitysystems]

thanks for the pr just a nitpick annotated and we'll also need a changefile :) (check .changes dir for examples)

Thanks for the review @FabianLars! Just pushed a commit to resolve your comments.

[FabianLars]

thanks :)

[lucasfernog]

amazing PR!