Issues passing in a private key for snowflake credentials block

[jsopkin]

Expectation / Proposal

Key should be able to be pasted into snowflake credentials block in UI

Traceback / Example

Using a private key added directly to the credentials block results in this error please provide a valid unencrypted rsa private key in der format as bytes object. It appears that there is a missing intermediary step that would allow for the key to be read properly. This issue does not happen when a private key path is passed in

• [ ] I would like to help contribute a pull request to resolve this!