* feat: API to fetch course-roles mapping by user and org
* fix: added docstring and resolve pylint issues
* feat: support bulk course team role updates via PUT API
* fix: refactor APIs based on user permissions
* chore: improve Swagger schema for course_team endpoints
* fix: refactor GET and PUT api code
* fix: apply pylint rules and optimize code
* fix: resolve test cases for supoort apis
* fix: change url path