add configurable support for both raw and base64 uploads

[briantist]

Fixes #105

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (1c706dd) 61.58% compared to head (ed5793f) 62.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
+ Coverage   61.58%   62.60%   +1.02%     
==========================================
  Files          32       33       +1     
  Lines        1463     1511      +48     
==========================================
+ Hits          901      946      +45     
- Misses        562      565       +3     

Files	Coverage Δ
galactory/utilities.py	44.52% <100.00%> (+7.31%)	⬆️
tests/unit/conftest.py	92.85% <100.00%> (+0.06%)	⬆️
.../unit/utilities/test_incoming_collection_stream.py	100.00% <100.00%> (ø)
galactory/__init__.py	31.25% <0.00%> (-0.33%)	⬇️
galactory/api/v2/collections.py	18.48% <0.00%> (-0.85%)	⬇️
galactory/api/v3/collections.py	23.25% <0.00%> (-0.78%)	⬇️

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