fix:cancellation_issue

[Clasherzz]

PR Description

Trying to resolve cancellation flow

Related Issues

• Closes Request cancellation flow error #622 ,Multipart request cancellation error #607

Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main branch before making this PR
• I am using the latest Flutter stable branch (run flutter upgrade and verify)
• I have run the tests (flutter test) and all tests are passing

Added/updated tests?

We encourage you to add relevant test cases.

• [] Yes
• No, and this is why: first would like to checkwhether approach is correct

OS on which you have developed and tested the feature?

• Windows
• macOS
• Linux

[Clasherzz]

@ashitaprasad this doesn't actually cancels the stream i think for that you need to store each stream in a queue and then cancel it ,let me know if it should be done. Other than that this branch is ready for a review.