Generate mapping routes from subclasses of Value and MappingStep

[jesper-friis]

Added two new arguments to mapping_routes() such that we can generate mapping routes based on custom subclasses of Value and MappingStep.

[codecov-commenter]

Codecov Report

Base: 66.94% // Head: 67.62% // Increases project coverage by +0.67% 🎉

Coverage data is based on head (14b507f) compared to base (a676c26).
Patch coverage: 70.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   66.94%   67.62%   +0.67%     
==========================================
  Files          14       14              
  Lines        1074     1078       +4     
==========================================
+ Hits          719      729      +10     
+ Misses        355      349       -6     

Impacted Files	Coverage Δ
tripper/triplestore.py	78.41% <ø> (ø)
tripper/mappings/mappings.py	50.87% <66.66%> (+2.83%)	⬆️
tripper/mappings/__init__.py	100.00% <100.00%> (ø)

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