Support for Snowflake RSA pub/priv keys from SECRETS

[oz-yolabs]

We use key pairs for all external clients and I don't see support for that here since it requires both a private key and passphrase. Any plans to add that soon?

Example of schemachange using key and passphrase:
https://github.com/Snowflake-Labs/schemachange#private-key-authentication

[nevdelap]

Now that users of type person require MFA and users of type service require keys and users of type legacy_service will not be supported from October 2026 that's when this would need to be done by for this action to continue to be usable.