upd: optimize folding

feat: add folding for editor

refactor: remove `ctx.editor.revealLineInCenter` `ctx.editor.revealLi…

…ne` `ctx.editor.setScrollToTop`

refactor: remove `ctx.constant`

upd: update table completion

feat: add insert mode for openai

upd: update openai shortcut

fix: fix demo

feat: add openai plugin