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/settings.json

@@ -13,5 +13,6 @@
         "checkstyle.header.file": "https://raw.githubusercontent.com/spring-cloud/spring-cloud-dataflow-build/main/spring-cloud-dataflow-build-tools/src/main/resources/checkstyle-header.txt"
     },
     "java.checkstyle.version": "8.29",
-    "java.configuration.maven.notCoveredPluginExecutionSeverity": "ignore"
+    "java.configuration.maven.notCoveredPluginExecutionSeverity": "ignore",
+    "java.jdt.ls.vmargs": "-XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable"
 }