Add a debug log for SAML and add configuration

The added configuration allows administrators to setup the specific SAML attribute names used by their SAML SSO service. It could for instance be that the displayName is configured with a different name than our default name for the attribute.

added 3 commits

• ebc594ca...93ce7a4e - 2 commits from branch development
• 940a9e97 - Add a debug log for SAML and add configuration

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mentioned in commit 2f8d9362