OIDC login and logout commands

[rgharris]

Authenticate the CLI via OIDC. This allows for easy authentication via CI providers that support signing OIDC tokens. You can use the CLI to get a short lived token and then use the token with our API if that format works best for your use case. Though just hitting the OIDC auth endpoint directly might be preferred in that case. Also, adds an option to revoke the generated short lived service account identity token as well.

I opted for the "login" and "logout" terminology primarily because "logout" sounds more aligned with the intended use case than "revoke". Logging out is totally optional as the tokens expire quickly (based on user configuration) regardless.

Example:

doppler oidc login --scope=. --identity=00000000-0000-0000-0000-000000000000 --token=$CIRCLE_OIDC_TOKEN_V2
doppler secrets --project example --config dev
doppler configure get token --plain # optionally retrieve the short lived token for use outside of the CLI
doppler oidc logout --scope=. # optional - short lived token expires quickly

Closes ENG-8516