* feat: add a method to find id spans between frontiers
* feat(wasm): expose frontiers (from&to) in event
* test: fix test
* chore: changeset
* refactor: rename to findIdSpansBetween
* test: fix test err
* refactor: rename the fields of version vector diff
replace `left` and `right` with `retreat` and `forward`
* docs: add more details about find_id_spans_between