* feat: inline sub page mention
* fix: disable editing documents in trash
* fix: duplicate block behavior
* refactor: clean up code
* feat: use formatText function instead of modify delta manually
* fix: paste behavior format mention
* fix: default icon for mentioned pages
* fix: view new parent turn into page reference
* test: add base test
* chore: add feature flag
* chore: default flag to on
* fix: minor fixes to behavior
* fix: review and code cleanup
* fix: dart linter
* fix: content is required
* test: use doc title to rename page
* test: add test coverage
* test: fix wrong expect
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Co-authored-by: Lucas.Xu <lucas.xu@appflowy.io>
