* feat: Added admin CLI, created api endpoint for creating new user, created action for admin CLI to create a new user, changed the authentication middleware to verify the users from db
* feat: Added both single and multi user support, added caching layer for getting IAM users
* fix: Added all the files
* fix: Fixed error cases of primitive values
* feat: Added unit test for: DeleteBucket, DeleteObjects, DeleteActions, HeadBucket, HeadObject, CreateActions controllers
* feat: Added unit tests for GetUserMetaData, CreateHttpRequestFromCtx, MarshalStructToXML utility functions
* fix: fixed CreateHttpRequestFromCtx unit test case