FR: Allow for Auth Provider Configs to be set

At the moment it appears that only OIDC and SAML providers can be set via the Go client. Would be incredibly useful to add Firebase auth providers such as phone and email/password so that we can programmatically manage this with something like Terraform.

## API
https://cloud.google.com/identity-platform/docs/reference/rest/v2/projects/updateConfig

## Note
It appears that the Node SDK has this functionality available already.