Add SAML authentication module

[Josipmrden]

Description

A new authentication module has been added which supports SAML assertion validation.

[master < Task] PR

• Provide the full content or a guide for the final git message
  • Add SAML authentication module

Documentation checklist

• Add the documentation label tag
• Add the bug / feature label tag
• Add the milestone for which this feature is intended
  • If not known, set for a later milestone
• Write a release note, including added/changed clauses
  • Added SAML authentication module
• Link the documentation PR here
  • Add SAML authentication module documentation#602
• Tag someone from docs team in the comments @kgolubic

[Josipmrden]

@antepusic @imilinovic just for info, since you're allocated for the work, feel free to take this over whenever you feel ready

[sonarcloud]

Quality Gate failed

Failed conditions
B Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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[gitbuda]

@Josipmrden & @antepusic is it true that this PR will be just closed after we merge #1990

[antepusic]

@gitbuda Yes, this PR is succeeded by #1990.

[Josipmrden]

Closed, not needed anymore