[Optimize][List] Implement list optimized anchor search algorithm #3946
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This commit mainly improves the accuracy of anchor point searching in list component: 1. Added weak_anchor_ref_ field in ItemHolder to store anchor reference ItemHolder for removed ItemHolders. 2. Update anchor reference ItemHolder for all removed on-screen ItemHolders before consuming diff info. 3. In list layout pass, if no valid anchor ItemHolder can be found from all on screen childre, we use the reference anchor ItemHolder as anchor ItemHolder in layout. 4. Add relative unittest and e2e tests. issue: m-6795355659
jianliang00
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