feat(jans-auth-server): add support for Identity Assertion JWT Authorization Grant #14142

[yuriyz]

Description

feat(jans-auth-server): add support for Identity Assertion JWT Authorization Grant

https://www.ietf.org/archive/id/draft-ietf-oauth-identity-assertion-authz-grant-04.html

Target issue

closes #14142

Test and Document the changes

• Static code analysis has been run locally and issues have been fixed
• Relevant unit and integration tests have been added/updated
• Relevant documentation has been updated if any (i.e. user guides, installation and configuration guides, technical design docs etc)

Please check the below before submitting your PR. The PR will not be merged if there are no commits that start with docs: to indicate documentation changes or if the below checklist is not selected.

• I confirm that there is no impact on the docs due to the code changes in this PR.

[mo-auto]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jans-auth-server-14142

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[sonarqubecloud]

Quality Gate passed for 'jans-pycloudlib'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud