feat: add new callback hook `on_checkpoint_write_end` #21323

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Draft

Iruos8805 wants to merge 6 commits into Lightning-AI:master from Iruos8805:feature/15795/on-checkpoint-write-end-callback

+92 −0

Draft

feat: add new callback hook `on_checkpoint_write_end` #21323

Merge branch 'master' into feature/15795/on-checkpoint-write-end-call…

Lit OSS [bot] / fabric.yml / Lit Job (nvidia/cuda:12.1.1-devel-ubuntu22.04, fabric, 3.10) succeeded Nov 12, 2025 in 11m 49s

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