[google_sign_in_tizen] Update to google_sign_in 7.2.0

[JSUYA]

• Update google_sign_in_platform_interface to 3.1.0.
• Update the Tizen Device Flow implementation for the google_sign_in 7.2.0 API.
• Add support for client authorization requests such as authorizationForScopes, authorizeScopes, and authorizationHeaders for Device Flow allowed scopes.
• Update minimum Flutter and Dart versions to 3.29 and 3.7.

#1010

[gemini-code-assist]

Code Review

This pull request updates the google_sign_in_tizen package to version 0.2.0, aligning it with the google_sign_in 7.2.0 API and the 3.1.0 platform interface. The changes implement new initialization and authentication flows, add support for client authorization requests for additional scopes, and improve the Device Flow implementation with polling cancellation and refined error handling. The example app and documentation are updated to reflect these changes. Feedback identifies a syntax error in the example app's authentication event handler and typos in variable names across the example and integration tests.

[seungsoo47]

When I tried to click 'Request Permissions' button, there is not any response or logs.
What should I do more to run this request?

[JSUYA]

When I tried to click 'Request Permissions' button, there is not any response or logs. What should I do more to run this request?

That feature is unsupported(it seems the exception handling in the frontend example is strange). I have modified it so that the exception message is displayed correctly. I have also added more explanations about unsupported features to the README.