Transaction and actions for workspace edit

[chemzqm]

When workspace edit fails, coc.nvim will revert the changes (including document edits and file operations) previous made.

Prompt for load files in disk is removed, the prompt would be shown when needsConfirmation in associated annotation is true.

Files used by workspace edit that not loaded will be opened by tab drop by default (like VSCode) to avoid possible issue with change for hidden buffers.

Added commands workspace.undo and workspace.redo for undo and redo previous workspace edit.

Quickfix and locations support for edits is removed, use command workspace.inspectEdit instead, which will show all changes with diff highlights, use <CR> for jump to change position under cursor.