Re: FLIP-510: Drop ChangelogNormalize for operations which don't need it

[Leonard Xu]

+1 for this proposal after went through Dawid and Xuyang’s discussion, and I 
think we can start a vote if there’re no objections.

For the naming, shorter is better in this case, +1 for 
ChangelogMode.keyOnlyDeletes() after discussed with ChatGPT.

Best,
Leonard