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## Summary The current definition of `Instance` in Fabric has 2 fields: - `node`: reference to the native node in the shadow tree. - `canonical`: public instance provided to users via refs + some internal fields needed by Fabric. We're currently using `canonical` not only as the public instance, but also to store internal properties that Fabric needs to access in different parts of the codebase. Those properties are, in fact, available through refs as well, which breaks encapsulation. This PR splits that into 2 separate fields, leaving the definition of instance as: - `node`: reference to the native node in the shadow tree. - `publicInstance`: public instance provided to users via refs. - Rest of internal fields needed by Fabric at the instance level. This also migrates all the current usages of `canonical` to use the right property depending on the use case. To improve encapsulation (and in preparation for the implementation of this [proposal to bring some DOM APIs to public instances in React Native](https://github.com/react-native-community/discussions-and-proposals/pull/607)), this also **moves the creation of and the access to the public instance to separate modules** (`ReactFabricPublicInstance` and `ReactFabricPublicInstanceUtils`). In a following diff, that module will be moved into the `react-native` repository and we'll access it through `ReactNativePrivateInterface`. ## How did you test this change? Existing unit tests. Manually synced the PR in Meta infra and tested in Catalyst + the integration with DevTools. Everything is working normally.