I started to see strange behavior where flags would merge across
subcommands. I'm not sure if the bug was in our 'append' usage or
in urfave/cli's handling of flag-slices, but this change seems to
fix the problem either way.
* 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
