feat: use mongodb official driver instead of mgo (#1782)
* wip: backup
* wip: backup
* wip: backup
* backup
* backup
* backup
* add more tests
* fix wrong dependency
* fix lint errors
* remove test due to data race
* add tests
* fix test error
* add mon.Model
* add mon.Model unmarshal
* add monc
* add more tests for monc
* add more tests for monc
* add docs for mon and monc packages
* fix doc errors
* chhore: add comment
* chore: fix test bug
* chore: refine tests
* chore: remove primitive.NewObjectID in test code
* chore: rename test files for typo
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