Remove created file if transfer failed

[veeso]

23 - Remove created file if transfer failed

Fixes #23

Description

This PR introduces the removal of the file just created after an upload/download whenever the transfer fails. The feature is implemented in a way that prevents the client to try to remove a file which previously existed, but only when the write process has failed (so the file is corrupted).

List here your changes

• Introduced a TransferErrorReason enum as return for upload/download functions.
• Also fixed upload errors not being shown after an error.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] 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

Checklist

• [x] My code follows the contribution 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] My changes generate no new warnings
• [x] I formatted the code with cargo fmt
• [x] I checked my code using cargo clippy and reports no warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] I have introduced no new C-bindings
• [x] The changes I've made are Windows, MacOS, UNIX, Linux compatible (or I've handled them using cfg target_os)
• [x] I increased or maintained the code coverage for the project, compared to the previous commit

[codecov[bot]]

Codecov Report

Merging #29 (fe51185) into 0.5.0 (f1225b1) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##            0.5.0      #29   +/-   ##
=======================================
  Coverage   70.44%   70.44%           
=======================================
  Files          30       30           
  Lines        2724     2724           
=======================================
  Hits         1919     1919           
  Misses        805      805           

Impacted Files	Coverage Δ
src/host/mod.rs	77.77% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update f1225b1...fe51185. Read the comment docs.