* build: add goimports to fmt target to remove unused imports
* feat: update codegen template to support returning raw response body
* feat: add support for gunzip-ing response bodies
* refactor: remove unused piece from codegen return values
* feat: update generated client to include schema-management APIs
* feat: implement interfaces to decode flags and CSV
* feat: implement decoders for different measurement schema column formats
* feat: extend bucket CLI commands to support schema type property
* feat: add CLI commands to manage measurement schema
* test: add unit tests for bucket schema create, update and list commands
