[client-backend]: Fix image name not set while uploading

[AkMo3]

Description

Changes:

1. The multipart form being sent to the backend contained an incorrect image name. We are enforcing the image_name now from the state and sending it to the backend.
2. Added backend functionality to handle new data
3. Fix Linting and import order of these

Fixes #629

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [x] npm test
• [x] flask test

Test Configuration:

• OS version: Ubuntu 20.04
• Hardware:
• Toolchain:
• SDK:

Also, include screenshots of app for the verification and reviewing purpose.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

[AkMo3]

@amlannandy Please find some time to review the PR.

[AkMo3]

https://user-images.githubusercontent.com/69365878/158864939-e29fa7fa-d278-47c5-a762-3fbc2938371b.mp4

Demo video as required.