feat: Added session management support for REST service

[nicolatimeus]

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Related Issue: This PR fixes/closes {issue number}

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• Adds session management, the new session/v1 rest endpoints can be used to create a session.
• The existing BASIC and certificate authentication mechanisms are still available, but can be disable with dedicated RestService configuration options.
• Adds a new UserAdminHelper helper class for interacting with the UserAdmin.
• Introduces a workaround for a OSGI JAX-RS connector issue that makes impossible to create http sessions, the workaround will likely be removed in the future.

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[nicolatimeus]

Build is failing due to this wierd sonarlint issue: https://sonarcloud.io/project/issues?resolved=false&severities=BLOCKER&sinceLeakPeriod=true&branch=PR-4855&id=org.eclipse.kura%3Akura&open=AYqO1XF26np3lwpGkziw. False positive?

[MMaiero]

Comment applied it is a false positive in Sonar.
Now that the item is solved the quality gate is green and the code can be merged.