3 refactor triplestore

[jesper-friis]

This is a new cleanup branch after all the mess that was introduced in #25

It has been reviewed several times and needs to be merged now. The only important issue that remains it that the CI workflow fails - most likely due to a bug in mypy.

[codecov-commenter]

Codecov Report

Base: 71.02% // Head: 73.57% // Increases project coverage by +2.55% 🎉

Coverage data is based on head (792d962) compared to base (a8491a3).
Patch coverage: 82.99% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   71.02%   73.57%   +2.55%     
==========================================
  Files           6       10       +4     
  Lines         528      598      +70     
==========================================
+ Hits          375      440      +65     
- Misses        153      158       +5     

Impacted Files	Coverage Δ
tripper/triplestore.py	79.70% <65.51%> (-0.71%)	⬇️
tripper/utils.py	77.46% <77.46%> (ø)
tripper/literal.py	84.74% <84.74%> (ø)
tripper/namespace.py	91.13% <91.13%> (ø)
tripper/__init__.py	100.00% <100.00%> (ø)
tripper/backends/ontopy.py	37.93% <100.00%> (ø)
tripper/backends/rdflib.py	96.55% <100.00%> (ø)
tripper/errors.py	100.00% <100.00%> (ø)

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