Add param to accept Base64String to Update-GSUserPhoto

[jgeron-suhsd]

Is your feature request related to a problem? Please describe. I'm able to pull images in the same format (Base64) from our Student Information System, so it would be nice to not have to write this to the drive and just pass the data through via a new optional param like -Base64String

Describe the solution you'd like Add -Base64String that accepts the raw data for image upload on the Google Profile Picture.