Justopinion

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* add CourtListener API interface to replace Case Access Project
* add CitationResponse model
* add OpinionCL model
* add DecisionCL model
* add OpinionCluster model
* bump eyecite, requests and vcrpy versions
* remove support for Python 3.9
* support Python 3.13
* use field_validator from Pydantic v2

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* support Python 3.10

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* bump anchorpoint version to 0.7.0
* add python-ranges as dependency

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* switch from setup.cfg to setup.py
* bump anchorpoint version to 0.5.3

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* add install_requires to setup.cfg

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* add exception for wrong API key
* change package detection in setup.cfg