refactor: Decouple extractors from AppContext using FromRef
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This allows extractors to pull out fields of `AppContext` as [substates](https://docs.rs/axum/0.8.8/axum/extract/struct.State.html\#substates) in handlers through [`FromRef::from_ref`](https://docs.rs/axum/latest/axum/extract/trait.FromRef.html)
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FromRef on AppContextAppContext using FromRef
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This PR derives
FromRef::from_refonAppContextto allow extractors to pull out fields ofAppContextas substates in handers. It also refactors our existing extractors to be able to work with any state that implementsFromRefto pull out the required substate (e.g.DatabaseConnection,Config,SharedStore,Cache, etc.).