Improve multilines commands formatting in JSON object

[slemeur]

Goals

Improve the CommandsJSON Object to better handle multilines commands.

Details

Before intelligent commands, we were handling multilines (or multi-instructions) commands by combining them using && characters. So a command was looking like this:

{
          "name": "build and deploy",
          "type": "mvn",
          "commandLine": "mvn -f ${current.project.path} clean install -DskipTests && cp ${current.project.path}/target/*.war $TOMCAT_HOME/webapps/ROOT.war && $TOMCAT_HOME/bin/catalina.sh run 2>&1",
          "attributes": {
            "previewUrl": "http://${server.port.8080}"
          }
}

With the introduction of the new command's editor, we are now allowing multiple lines in command's definition. In order to do that, we have to replace && by \n. But the way we are handling it into the JSON object is making the command hard to read.

{
          "name": "build and deploy",
          "type": "mvn",
          "commandLine": "mvn -f ${current.project.path} clean install -DskipTests \ncp ${current.project.path}/target/*.war $TOMCAT_HOME/webapps/ROOT.war \n$TOMCAT_HOME/bin/catalina.sh run 2>&1",
          "attributes": {
            "previewUrl": "http://${server.port.8080}",
            "goal": "Run"
          }
}

We need to improve the representation of the Command JSON object so that it will stay readable and better formatted.
The proposal would be the following:

{
          "name": "build and deploy",
          "type": "mvn",
          "commandLine": [
                  "mvn -f ${current.project.path} clean install -DskipTests",
                  "cp ${current.project.path}/target/*.war $TOMCAT_HOME/webapps/ROOT.war", 
                  "$TOMCAT_HOME/bin/catalina.sh run 2>&1"
          ],
          "attributes": {
            "previewUrl": "http://${server.port.8080}",
            "goal": "Run"
          }
}

Linked issues:

#4274