Removed persistent storage modules.

[rohe]

We are not doing persistent storage anymore within the package.
It's all supposed to be done by the application using this package.
What we provide is dump/load/flush methods.

[peppelinux]

ok, just get tests and CI working 👍

[codecov-commenter]

Codecov Report

Merging #35 (73fa928) into master (6c898e8) will increase coverage by 10.75%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master      #35       +/-   ##
===========================================
+ Coverage   67.27%   78.02%   +10.75%     
===========================================
  Files          23       15        -8     
  Lines        2857     2426      -431     
===========================================
- Hits         1922     1893       -29     
+ Misses        935      533      -402     

Impacted Files	Coverage Δ
src/oidcmsg/__init__.py	51.16% <100.00%> (ø)
src/oidcmsg/item.py	55.95% <100.00%> (ø)
src/oidcmsg/oidc/identity_assurance.py	63.04% <100.00%> (ø)

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