ExeUnit transfer component separation

[nieznanysprawiciel]

Main goal of this PR is separating transfer library as distinct crate to allow ya-runtime-ai to deploy models.
A few additional changes and fixes were made:

• Transfer examples were rewritten to SystemTests (feature framework-tests)
• Transferring compressed files isn't working (issue: Fix downloading archives in ExeUnit #2953), so it was moved to separate test and #[ignore]
• Problem with VM image corrupted was fixed (Partially downloaded files from previous ExeUnit executions were incorrectly hashed)
  • If file already existed on disk, HashStream loads currently existing data first (happens in case of retries)
  • If image download was not completed in previous execution, it is removed to avoid problems
• File transfers to container:// can be retried and previous progress won't be lost