Authorityspoke

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* update eyecite and lxml dependencies to avoid Python 3.10 build error
* add 3.10 to supported Python versions

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* replace marshmallow serializers with pydantic
* add OpinionReading methods for getting anchored terms/passages
* add OpinionReading.anchored factors property
* add AnchoredHoldings.add_enactment method
* add AnchoredHoldings.insert_term method
* rename AnchoredHoldings.insert_term to add_term
* fix bug in "ignore" parameter to collect_mentioned data loading function
* fix bug: wrong function was used to expand text in enactment test data
* import CaseBody and CaseData models from Justopinion
* bump legislice dependency to 0.7.0
* bump anchorpoint dependency to 0.7.0
* remove marshmallow and marshmallow-oneofschema dependencies
* remove apispec and apispec-oneofschema dependencies
* remove enactment_index module
* remove downloads module
* remove schemas_yaml module
* remove EnactmentIndex class
* remove OpinionReading.implies_other_holdings method
* remove load_anchored_holdings function
* remove load_rules_with_index function
* remove collect_enactment_anchors function
* remove read_fact function
* remove TextLinkDict type annotation

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* limit version range for Legislice import

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* import Opinion, Decision, and Court data classes from Justopinion package
* depend on Justopinion package to download caselaw with CAPClient class
* Holdings of an Opinion are now stored on an OpinionReading, not on the Opinion
* read_decision function now makes a DecisionReading, not a Decision
* install with setup.py, not setup.cfg
* fix error in Opinion.explain_contradiction(HoldingGroup)

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* accept added fields in CAPCitation schema
* change method for FakeEnactment finding file

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* change "quotes" schema field names to "anchors"
* add doctests to documentation
* update example in readme to work with current version
* use new Eyecite API changing "base_citation" to "corrected_citation"