[FEATURE] Hide secrets from logs when running command with `doppler run --hide-secrets `

Is your feature request related to a problem? Please describe.
When using doppler on Github Actions with a command like doppler run -- printenv your secrets will be leaked in the Github actions logs

Usually Github Actions replaces Github Actions secrets with **** in the logs, but if you use doppler you won't have this feature

This is also useful if you are streaming on Twitch and want to show your terminal logs safely

Describe the solution you'd like
When running doppler run --hide-secrets replace all doppler secrets instances with **** characters

Describe alternatives you've considered

Additional context
It would also be useful to add the option --show SECRET_NAME to allow some secrets to be shown, useful if you are storing non sensitive data in doppler and want to show them in logs

Start at the CLI entry point for doppler run and trace how command output is handled. The feature is done when --hide-secrets masks Doppler secret values as **** in output, with the requested --show SECRET_NAME behavior defined and covered by relevant CLI tests.