feat(dowloader): resume partial downloads (#4537)

* feat(resume downloads): add basic tests

Signed-off-by: Saarthak Verma <saarthakverma739@gmail.com>

* test(resume downloads): implement file download tc

Signed-off-by: Saarthak Verma <saarthakverma739@gmail.com>

* test(resume downloads): add resume partial download test

Signed-off-by: Saarthak Verma <saarthakverma739@gmail.com>

* feat(resume downloads): implement resumable downloads for interrupted transfers

- Adds support for resuming partially downloaded files
- Uses HTTP Range header to continue from last byte position
- Maintains download progress across interruptions
- Preserves partial downloads with .partial extension
- Validates SHA256 checksum after completion

Signed-off-by: Saarthak Verma <saarthakverma739@gmail.com>

* fix(resume downloads): incorrect download percent on front end

Signed-off-by: Saarthak Verma <saarthakverma739@gmail.com>

* feat(resume download): add range header check tc

Signed-off-by: Saarthak Verma <saarthakverma739@gmail.com>

* feat(resume download): implement range header check

Signed-off-by: Saarthak Verma <saarthakverma739@gmail.com>

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Signed-off-by: Saarthak Verma <saarthakverma739@gmail.com>