fix: optimize block variables and lexical state updates #3689
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Changes
This PR fixes an issue in Lexical state updates, when many instances of the editor are present in the view at the same time.
I also optimized handling of block variables overall, by adding better memoization to reduce callback recreation on variable value updates.
How Has This Been Tested?
Manually, in a page with content rich blocks, with many instances of Lexical.