add api module

[atrisovic]

Closes #36

• In the previous implementation, API would download ALL files from DV, select the ones to work with and delete the rest.
• Now, the API first constructs the dataset name from the user parameters (__get_filenames_from_arguments) then looks for the fileids (__get_fileids_from_filenames) and then downloads only those files by fileid.
• You can now test the code with "spacebench nn continuous 20"

[codecov-commenter]

Codecov Report

Merging #42 (177172a) into dev (0bc3a12) will increase coverage by 7.13%. The diff coverage is n/a.

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@@            Coverage Diff             @@
##              dev      #42      +/-   ##
==========================================
+ Coverage   40.00%   47.13%   +7.13%     
==========================================
  Files           3        3              
  Lines         195      157      -38     
==========================================
- Hits           78       74       -4     
+ Misses        117       83      -34     

Flag	Coverage Δ
unittests	47.13% <ø> (+7.13%)	:arrow_up:

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Impacted Files	Coverage Δ
spacebench/datasets/datasets.py	42.24% <ø> (+7.82%)	:arrow_up:

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[mauriciogtec]

I think this is a good step forward. What's still missing is to use a masterfile with the available datasets instead of hardcoding the name (.e.g, medisynth) in the code. I'm going to approve and merge and we can raise a new issue to add the masterfile.