feat: support authorizations v2 api

[BoxBoxJason]

Description of your changes

This PR adds the support of the entire authorizations v2 API (all of its existing endpoints).

Closes #180
Closes #179

I have:

• Followed the git conventional commit message format.
• Made sure all changes are covered by proper tests, reaching a coverage of at least 80% when applicable.

How has this code been tested

I have:

• Made sure make lint passes to verify that the code style is correct.
• Made sure make test passes to verify that the code is working as intended.
• Made sure make e2e passes to verify that end-to-end tests pass against a real SonarQube instance.
• Added unit tests to cover the code changes.
• Added end-to-end tests if necessary.

[Copilot]

Pull request overview

Adds SonarQube V2 Authorizations support to the Go SDK, implementing the missing REST endpoints for authorization groups and group memberships (issues #180, #179).

Changes:

• Implemented V2 Authorizations service methods for groups and group-memberships CRUD/search.
• Added unit tests for the new V2 Authorizations service.
• Added end-to-end (Ginkgo) integration tests covering the new V2 endpoints.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
sonar/authorizations_v2_service.go	Introduces V2 Authorizations service, request/response models, and validation + methods for groups and memberships.
sonar/authorizations_v2_service_test.go	Adds unit tests for the new service methods and validations.
integration_testing/v2_authorizations_test.go	Adds e2e coverage for group + membership workflows against a real SonarQube instance.

---

You can also share your feedback on Copilot code review. Take the survey.