Summary:
changelog: [internal]
This diff introduces a mechanism to cache NSTextStorage on Paragraph's state. The old renderer already has caching for NSTextStorage: https://github.com/facebook/react-native/blob/main/Libraries/Text/Text/RCTTextShadowView.m#L21
Fabric will store `NSTextStorage` inside `ParagraphLayoutManager` which is owned by state.
There is one notable change which is not gated: Paragraph's state strongly owns `TextLayoutManager`, not `ParagraphShadowNode` like previously. This shouldn't change anything
Reviewed By: mdvacca
Differential Revision: D43692171
fbshipit-source-id: efe6077222a30ab6d89abd9916534b9a96e745d4
Samuel Susla