[GREEN] Implement GoogleAuthDTO model

src/main/java/com/safetypin/authentication/dto/GoogleAuthDTO.java

+package com.safetypin.authentication.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+
+@Setter
+@Getter
+@EqualsAndHashCode
+@ToString
+public class GoogleAuthDTO {
+
+    @NotBlank
+    private String idToken;
+
+    @NotBlank
+    private String serverAuthCode;
+}
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