CLI should be able to drive with environment variables

[jakedoublev]

Background

Some global flags should be able to be passed as environment variables instead of flags only.

1. --json
2. --with-client-creds
3. --with-client-creds-file
4. --debug
5. --tls-no-verify
6. --host
7. --profile

Acceptance Criteria

1. flags that make sense are able to be read from the environment
2. environment variables (if found) take precedence over flag arguments or native OS keyring values (auth)
3. new option is documented