Initial terminal ui implementation

- This commit adds proof of concept work for terminal ui as is.
- Some things work, some don't but we need to start from somewhere.
  Further development continues in a main.
- Essentially we are starting to have enough so that it merits to
  move all this work into a main repo.
- Everything new is kept under org.springframework.shell.component.view
  and will get revisiter later to find correct locations for some classes.
- Catalog sample has been modified to provide "showcase" app for
  terminal ui features. This is a start while it already contains
  some usefull scenarios.
- Relates #800
- Relates #801
- Relates #802
- Relates #803
- Relates #804
- Relates #805
- Relates #806
- Relates #807
- Relates #808
- Relates #809
- Relates #810
- Relates #811

.vscode/launch.json

@@ -94,6 +94,13 @@
             "mainClass": "org.springframework.shell.samples.SpringShellSample",
             "projectName": "spring-shell-sample-e2e",
             "args": "e2e reg exit-code --arg1 fun"
+        },
+        {
+            "type": "java",
+            "name": "catalog",
+            "request": "launch",
+            "mainClass": "org.springframework.shell.samples.catalog.SpringShellApplication",
+            "projectName": "spring-shell-sample-catalog"
         }
     ]
 }