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Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/51065 This adds infrastructure to let us start storing cached Android text layouts as part of a `ParagraphShadowNode`. After this, we will clear them out, and propagate them to state. Right now, the flag doesn't do much, apart from extra work. This is done by adding `TextLayoutManagerExtended::supportsPreparedLayout()`, and `TextLayoutManager::PreparedLayout` types, to shim between platforms, then on Android, we add a `PreparedLayout`, which is for now just an Android layout, with extra field (`maxNumberOfLines`, for some reason not exposed on recent versions). Android `TextLayoutManager` java side is split a little bit, so that we reuse all the existing logic for prepared layouts. I tried to set up the boundary, so that we don't reserialize a MapBuffer after preparation, and for simplicity, this means source of truth for attachment count, and attachment sizes, now lives on the layout. This means we need to change boundary a bit, where we are no longer able to pass in a buffer to fill from C++ side of attachment positions. Changelog: [Internal] Reviewed By: mdvacca Differential Revision: D73970149 fbshipit-source-id: ff71c227e062c16fe52a4eb3ba2acbebf3d96e56