feat(serviceaccount): add interactive mode for the reset credentials command

[craicoverflow]

Resolves #248

This PR adds an interactive prompt when resetting credentials for a service account.

Flow

❯ rhoas serviceaccount reset-credentials
? Service account ID: 813c4000-3c1d-4393-bb78-ea0c2af8594a
? Credentials output format: properties
? Credentials file location: /home/ephelan/code/github.com/bf2/cli/credentials.properties
? The file '/home/ephelan/code/github.com/bf2/cli/credentials.properties' already exists. Do you want to overwrite it? Yes
? Are you sure you want to reset the credentials for the service account with ID '813c4000-3c1d-4393-bb78-ea0c2af8594a'? Yes
Service account credentials reset
Credentials saved to /home/ephelan/code/github.com/bf2/cli/credentials.properties