feat(auth): Implement Google OAuth 2.0 integration with user creation and JWT generation

- Added Google OAuth controller and service to handle authentication via Google.
- Introduced DTOs for Google user and token responses.
- Updated AuthService and UsersService traits to support new Google OAuth functionality.
- Implemented logic to create a new user if they do not exist in the system after Google authentication.
- Enhanced existing user retrieval and JWT generation upon successful login.
- Added tests for Google OAuth flow, including login redirection and callback handling for both new and existing users.
- Updated environment configuration to include Google OAuth credentials.

imphnen-iam/src/v1/auth/google/google_oauth_dto.rs

@@ -0,0 +1,23 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct GoogleUser {
+    pub id: String,
+    pub email: String,
+    pub verified_email: bool,
+    pub name: String,
+    pub given_name: String,
+    pub family_name: String,
+    pub picture: String,
+    pub locale: String,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct GoogleTokenResponse {
+    pub access_token: String,
+    pub expires_in: u64,
+    pub refresh_token: Option<String>,
+    pub scope: String,
+    pub token_type: String,
+    pub id_token: String,
+}