Add Derivation, Publication, ScientificArtifactPublicationLink

[eleftherioszisis]

Implements #96

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 26 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/entitysdk/models/publication.py	0.00%	11 Missing ⚠️
...sdk/models/scientific_artifact_publication_link.py	0.00%	8 Missing ⚠️
src/entitysdk/models/derivation.py	0.00%	7 Missing ⚠️

Flag	Coverage Δ
pytest	99.04% <87.50%> (-0.96%)	⬇️

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Files with missing lines	Coverage Δ
src/entitysdk/_server_schemas.py	100.00% <100.00%> (ø)
src/entitysdk/route.py	100.00% <ø> (ø)
src/entitysdk/types.py	100.00% <100.00%> (ø)
src/entitysdk/models/derivation.py	0.00% <0.00%> (ø)
...sdk/models/scientific_artifact_publication_link.py	0.00% <0.00%> (ø)
src/entitysdk/models/publication.py	0.00% <0.00%> (ø)

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