[KARAF-155] optional @Argument values (and I guess @Option values) can have default values which could be displayed in the help screen by reflecting into the value and finding non-zero/null values - ASF JIRA

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For example for

class MyCommand extends Action {
  @Argument(required = false, description = "whatnot")
  String foo = "someDefault";

   ...
}

when printing the help for "foo" argument we could mention the default value is "someDefault" in the help screen.