Make object storage serializer pluggable

[c-w]

No description provided.

[codecov-io]

Codecov Report

Merging #117 into master will decrease coverage by 0.13%.
The diff coverage is 92.59%.

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
- Coverage   91.31%   91.18%   -0.14%     
==========================================
  Files          21       21              
  Lines         887      885       -2     
==========================================
- Hits          810      807       -3     
- Misses         77       78       +1

Impacted Files	Coverage Δ
opwen_email_server/config.py	95% <100%> (ø)	⬆️
opwen_email_server/services/storage.py	96.08% <100%> (-0.36%)	⬇️
opwen_email_server/actions.py	95.97% <100%> (+0.04%)	⬆️
opwen_email_server/utils/serialization.py	94.73% <85.71%> (-5.27%)	⬇️
opwen_email_server/utils/log.py	89.41% <0%> (+1.17%)	⬆️

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