SSO: Prepare for integrating SAML into grafana_sso_settings
resource
#1473
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This PR introduces some changes from the previous behaviour. With the new logic we make sure that settings returned by the read function also exist in the terraform state. We do this because usually terraform manages only a subset from the complete set returned by the SSO settings API.
A special case is when the terraform state is empty for a provider. This happens when importing a provider configuration into terraform. In this case all settings from the API will be returned.
The new behaviour will be covered by tests when adding support for SAML in a followup PR.