Edit: Cycle Case Style
edit.case.cycle Cycle the selection or the identifier at the caret through camelCase, snake_case, SCREAMING_SNAKE_CASE, kebab-case and PascalCase.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for Edit: Cycle Case Style, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.