feat: add sub-menu(s) to CellMenu & ContextMenu plugins#867

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ghiscoding merged 13 commits intomasterfrom feat/context-sub-menus

Oct 20, 2023

+1,292-567

Commits on Oct 18, 2023

Commits on Oct 20, 2023

chore: fix open different sub-menu tree left previous sub-menu tree open
ghiscoding-SE
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