#970 single logging framework should be enforced (#982)

* #496 Add pipeline module to parent pom ✨

* #496: Add main application class and test for pipeline

* #496: Checkstyle format and add log messages on pipeline stages 🎨

* #496: Fill readme sections of pipeline ✨

* #496: Javadocs and checkstyle formatting 🎨

* #496: Follow PMD checks and add more explanation as block comment on App.java

* #496: Apply requested PR changes by iluwatar 🎨

* #970: Replace log4j usage on commander pattern to Slf4j API 🎨

* #970: Replace log4j usage on dao pattern to Slf4j API 🎨

* #970: Replace log4j usage on data mapper pattern to Slf4j API 🎨

* #970: Remove log4j dependency on data transfer object pom 🔥

* #970: Replace log4j usage on module pattern to Slf4j API 🎨

* #970: Replace log4j usage on serverless pattern to Slf4j API 🎨

This also removes the aws log4j dependency

* #970: Remove unnecessary gitignore line for log4j.xml 🔥

* #970: Remove remaining remnants of log4j 🔥

* #970: Replace System.out logging with appropriate logging methods 🎨

* #970: Replace System.out method references to Logger::info 🎨

pom.xml

@@ -56,10 +56,8 @@
         <logback.version>1.2.3</logback.version>
         <aws-lambda-core.version>1.1.0</aws-lambda-core.version>
         <aws-java-sdk-dynamodb.version>1.11.289</aws-java-sdk-dynamodb.version>
-        <aws-lambda-log4j.version>1.0.0</aws-lambda-log4j.version>
         <aws-lambda-java-events.version>2.0.1</aws-lambda-java-events.version>
         <jackson.version>2.8.5</jackson.version>
-        <log4j.version>1.2.17</log4j.version>
         <jaxb-api.version>2.3.1</jaxb-api.version>
         <jaxb-impl.version>2.3.2</jaxb-impl.version>
         <annotation-api.version>1.3.2</annotation-api.version>
@@ -304,11 +302,6 @@
                 <artifactId>mongo-java-driver</artifactId>
                 <version>${mongo-java-driver.version}</version>
             </dependency>
-            <dependency>
-                <groupId>log4j</groupId>
-                <artifactId>log4j</artifactId>
-                <version>${log4j.version}</version>
-            </dependency>
             <dependency>
                 <groupId>javax.xml.bind</groupId>
                 <artifactId>jaxb-api</artifactId>