Use isolates for image compression

[monsieurtanuki]

Use isolates for image compression (uploaded cropped JPEG) with the new flutter 3.7 feature: background isolate channels.
With isolates we won't have the stuttering side-effect of intensive compression computations, e.g. the circular progress indicator when sending a new cropped image will play perfectly.

Originally posted by @monsieurtanuki in #3682 (comment)

• cf. Privacy review of server-side cropping #3656 feat: 3656 - optimized JPEG compression #3682

Part of

• Photo upload (tracker) #513

[Skdahale]

Can I work on this issue

[monsieurtanuki]

@Skdahale Please work on it.
As far as I understand the referenced links, it should be a simple init in the main and a compute for each call.

[Skdahale]

Yes, but where is the reference link
what is path

[monsieurtanuki]

@Skdahale

Use isolates for image compression (uploaded cropped JPEG) with the new flutter 3.7 feature: background isolate channels.

[Skdahale]

main.zip

I added compressImage flutter image compression

[monsieurtanuki]

If you've coded something that you want to be merged, please create a branch locally and send a Pull Request.

[Skdahale]

Yes, sir but please check isn't correct

[monsieurtanuki]

Don't worry, if you send a Pull Request that is not correct I'll let you know anyway.