Feature/download fileid

[kostas-kou]

Related issue(s) and PR(s)
This PR closes #414.

Description
It was implemented in the sda_download that the user can download files by providing the file id.
This PR:

• fixes the download path which was wrong when this case was used
• added this case in the integration test
• updated the readme file with info about downloading by providing the file id

How to test
Spin up containers by running:

bash .github/integration/setup/setup.sh

and then run:

./sda-cli sda-download -config testing/s3cmd-download.conf -dataset-id https://doi.example/ty009.sfrrss/600.45asasga -url http://localhost:8080 -outdir download-fileid urn:neic:001-001

and you should see the file in the download-fileid/main/subfolder/dummy_data path

[pahatz]

Works great!

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 41.60%. Comparing base (93e406c) to head (533cdcf).

Files	Patch %	Lines
sda_download/sda_download.go	83.33%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #417   +/-   ##
=======================================
  Coverage   41.60%   41.60%           
=======================================
  Files          13       13           
  Lines        2024     2024           
=======================================
  Hits          842      842           
  Misses       1063     1063           
  Partials      119      119           

Flag	Coverage Δ
unittests	41.60% <83.33%> (ø)

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