feat: add undojoin as a format option (#488)
* feat: add new format option: undojoin
This option allow user to automatically perform undojoin command before
formatting. This is useful if the user uses an autosave plugin + format
on save, because in case of undo, it will undo the last change AND the
formatting. Without this option, it will only undo the formatting.
* fix: passed linting
* fix: apply undojoin for LSP formatting
* doc: fix type annotations for apply_format
* doc: regenerate documentation
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Co-authored-by: Steven Arcangeli <stevearc@stevearc.com>
