fix(UrlRequest): Add "on_finish" and add alternative implementation

[NomadDemon]

• Added "on_finish" callback to URlRequest, it fires always when the request is done
• Added alternative implementation for UrlRequest based on REQUESTS lib
• It have also implemented "on_finish" and "auth" params for easy BASICAUTH handling
• Refactored tests of new implementation to be mocked by RESPONSES, so we dont need real network to test nor we dont ping real servers during tests

Maintainer merge checklist

• [ ] Title is descriptive/clear for inclusion in release notes.
• [ ] Applied a Component: xxx label.
• [ ] Applied the api-deprecation or api-break label.
• [ ] Applied the release-highlight label to be highlighted in release notes.
• [ ] Added to the milestone version it was merged into.
• [ ] Unittests are included in PR.
• [ ] Properly documented, including versionadded, versionchanged as needed.

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[NomadDemon]

Iam not sure if my changes in "setup" are ok, never changed stuff in setup of any package I just wanted the project to download requests and responses with it [they are wide used in real world]

[NomadDemon]

this new implementation have same interface as old "UrlRequest" just changed backend to more flexible [and tests are now made as they should be made]

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