* feat: utility methods for docstatus
* refactor: use utility method for doctsatus
* refactor: enum for docstatus
* refactor: docstatus as property
* fix: set docstatus
* feat: docstatus extends int class
* test: docstatus of BaseDocument
* refactor: occurrences of docstatus
* fix: typo
* refactor: move docstatus to a separate file
* test: docstatus
* fix: sider
