[Java][Client Default] Support of AWS Signature V4 (#14287)

* Add support of AWSV4 Signature in Java

* Add Petstore sample for AWSV4 Signature

* Update other sample examples

* Sync Documentation and sample

* Specify only available for okhttp-gson in doc

samples/client/petstore/java/okhttp-gson-group-parameter/pom.xml

@@ -305,6 +305,7 @@
             <artifactId>jackson-databind-nullable</artifactId>
             <version>${jackson-databind-nullable-version}</version>
         </dependency>
+
         <dependency>
             <groupId>javax.ws.rs</groupId>
             <artifactId>jsr311-api</artifactId>

samples/client/petstore/java/okhttp-gson-group-parameter/src/main/java/org/openapitools/client/ApiClient.java

@@ -533,6 +533,18 @@ public class ApiClient {
         throw new RuntimeException("No OAuth2 authentication configured!");
     }
 
+    /**
+     * Helper method to set credentials for AWSV4 Signature
+     *
+     * @param accessKey Access Key
+     * @param secretKey Secret Key
+     * @param region Region
+     * @param service Service to access to
+     */
+    public void setAWS4Configuration(String accessKey, String secretKey, String region, String service) {
+        throw new RuntimeException("No AWS4 authentication configured!");
+    }
+
     /**
      * Set the User-Agent header's value (by adding to the default header map).
      *