Support explicit arity min max with @Option

- @Option now has arityMin/arityMax which if defined,
  non-negative, are used instead of arity.
- Fixes #731

spring-shell-samples/src/main/java/org/springframework/shell/samples/e2e/ArityCommands.java

@@ -73,7 +73,7 @@ public class ArityCommands {
 
 		@Command(command = "arity-string-array")
 		public String testArityStringArrayAnnotation(
-				@Option(longNames = "arg1", defaultValue = "true", arity = OptionArity.ZERO_OR_MORE)
+				@Option(longNames = "arg1", defaultValue = "true", arityMax = 3)
 				String[] arg1
 		) {
 				return "Hello " + Arrays.asList(arg1);