Remove nexus_sdk from nexus store when uploading files and add x-nxs-file-content-length to header

[crisely09]

Changes:

• Replace the use of nexus_sdk with requests.post call
• Add x-nxs-file-content-length parameter to headers

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 36.36364% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 75.65%. Comparing base (be27bb6) to head (bc53dac).

Files	Patch %	Lines
kgforge/specializations/stores/bluebrain_nexus.py	30.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #403      +/-   ##
==========================================
- Coverage   75.69%   75.65%   -0.05%     
==========================================
  Files         103      103              
  Lines        6753     6761       +8     
==========================================
+ Hits         5112     5115       +3     
- Misses       1641     1646       +5     

Flag	Coverage Δ
unittests	75.65% <36.36%> (-0.05%)	⬇️

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