* fix: fixed the cursor not moving to next line after inserting divider
* test: added test
* fix: fixed failing checks
* fix: fixed issues from code review
* refactor: removed the use of depriciated function
* feat: Added divider to work with *
* chore: Resolved the suggested changes
* refactor: removed the check for star character
* feat:added character variable to insert divider .
* feat: support converting stars ** to divider
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Co-authored-by: Lucas.Xu <lucas.xu@appflowy.io>